I have been seeing weird cases of obvious spam not being analyzed by Spamassassin, and I found this explanation in uribl.com:
How can we fix this on a cPanel server? I don't know the location of the file, or if cPanel will overwrite it with an older version.Dec 9th, 2014: .LINK Spam
If you are using SpamAssassin, and are currently getting a bunch of spam with *.link TLDs, it is because those URLs are not being checked against URIBLs. In order to check .LINK URLs, you will need to upgrade your RegistrarBoundaries.pm.
If you are running a recent version of SpamAssassin such as 3.3.2 or 3.4, simply download the RegistrarBoundaries.pm from SpamAssassin SVN and replace the one you currently have installed. Restart spamd if you run it for the change to take effect.
Link to SVN: