Thursday, September 24, 2015

Malicious pdf AND document

Found a couple interesting pdfs, and I've only had a chance to dig into one of them so far. Anyways, opening this pdf you see a “PDF is Secured. VIEW ONLINE HERE” and below that a blurred out section document with more “Secured, VIEW HERE” nonsense. The URL it shows, is hxxp://tinyurl[.]com/o7s66zo

If you jump down this rabbithole, you’re redirected to hxxp://www.eitool[.]com/SanJose/help/userguide_files/adobe-cooperation-secure/index.php
This site is simply asking you to sign in with your email and password, typical credential harvesting scam. There’s a fair bit of javascript involved, and may be some landing page style nonsense going on, but from my analysis box I don’t see anything, could just be the harvest. I may try and dig into that more later.

Anyways, if you DO sign in, things get a little more interesting. I threw in the throwaway credentials I have set up exactly for instances like this, and it had me download a .doc file. Interesting, I had expected to be redirected to a public junk pdf.

Hmmm, does this doc contain macros? Why yes… yes it does. Though it looks like they didn’t really configure it? There’s a CitiBank logo at the top, and below that it says “Put here some text to be more trustworthy!” Hahahaha, that’s pretty hilarious. The rest of the English is pretty special too.

If you run the macro, it reaches out to hxxp://hotelsanjuliansas[.]com/components/billzkencrypt11.exe
. I tried to run it, but apparently it requires .net 4.0? VT has a pretty massive 33/57 hit on it (md5sum 5bb68067ca34e94b875b3c56e3b31e48) so I’m not sure if I’m too worried about trying to analyze it.

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