diff --git a/README.md b/README.md
index d5bc607..abdd1a3 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ A curated list of awesome malware analysis tools and resources. Inspired by
   analysts.
 * [ViruSign](http://www.virusign.com/) - Malware database that detected by
   many anti malware programs except ClamAV.
-* [VirusShare](http://virusshare.com/) - Malware repository, registration
+* [VirusShare](https://virusshare.com/) - Malware repository, registration
 * [Zeltser's Sources](https://zeltser.com/malware-sample-sources/) - A list
   of malware sample sources put together by Lenny Zeltser.
 * [Zeus Source Code](https://github.com/Visgean/Zeus) - Source for the Zeus
@@ -272,7 +272,7 @@ research.
 * [SenderBase](http://www.senderbase.org/) - Search for IP, domain or network
   owner.
 * [SpamCop](https://www.spamcop.net/bl.shtml) - IP based spam block list.
-* [SpamHaus](http://www.spamhaus.org/lookup/) - Block list based on
+* [SpamHaus](https://www.spamhaus.org/lookup/) - Block list based on
   domains and IPs.
 * [Sucuri SiteCheck](https://sitecheck.sucuri.net/) - Free Website Malware
   and Security Scanner.
@@ -327,7 +327,7 @@ the [browser malware](#browser-malware) section.*
   malicious traces in MS Office documents.
 * [olevba](http://www.decalage.info/python/olevba) - A script for parsing OLE
   and OpenXML documents and extracting useful information.
-* [Origami PDF](https://code.google.com/p/origami-pdf/) - A tool for
+* [Origami PDF](https://code.google.com/archive/p/origami-pdf) - A tool for
   analyzing malicious PDFs, and more.
 * [PDF Tools](http://blog.didierstevens.com/programs/pdf-tools/) - pdfid,
   pdf-parser, and more from Didier Stevens.
@@ -428,7 +428,7 @@ the [browser malware](#browser-malware) section.*
   debugger support.
 * [SMRT](https://github.com/pidydx/SMRT) - Sublime Malware Research Tool, a
   plugin for Sublime 3 to aid with malware analyis.
-* [strace](http://sourceforge.net/projects/strace/) - Dynamic analysis for
+* [strace](https://sourceforge.net/projects/strace/) - Dynamic analysis for
   Linux executables.
 * [Udis86](https://github.com/vmt/udis86) - Disassembler library and tool
   for x86 and x86_64.