Malicious PDF — malware analysis report

Static analysis result for SHA-256 116c544a403ac34f…

MALICIOUS

PDF

50.6 KB Created: 2018-06-11 09:37:50 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: a6f616bbc647eee538d6403d762d379f SHA-1: cd66ef5ef8f22920627dedc90526c51f8e0cbc75 SHA-256: 116c544a403ac34f54487ff354f8262216b2ffcf51559b61f58f7a9c345d6381
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is classified as malicious by an ML model and contains heuristics indicating it is a fake 'free download' SEO-poisoning lure. The document body and embedded URLs point to a download gateway at 'uncpbisdegree.com', suggesting the primary goal is to trick the user into downloading a secondary payload. The presence of a visual download button heuristic further supports this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6828

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uncpbisdegree.com/download3.php?q=troubleshoot-mercury-outboard-ignition.pdf
    • http://uncpbisdegree.com/download4.php?q=troubleshoot-mercury-outboard-ignition.pdf
    • https://www.marineengine.com/repair-help/mercury-mariner/ignition-coils.php
    • https://www.marineengine.com/repair-help/
    • https://www.marineengine.com/repair-help/mercury-mariner/
    • https://ourpastimes.com/troubleshooting-ignition-problems-mercury-outboard-5498403.html
    • https://outboardparts.com/troubleshooting/troubleshooting7.htm
    • http://www.outboardignition.com/tips.asp
    • https://www.boatpartstore.com/page20.asp
    • http://www.outboardparts.com/mercury/troubleshooting/printguide.htm
    • https://www.boatpartstore.com/tips.asp
    • http://www.outboardignition.com/page39.asp
    • http://riverside-resort.net/1/signal-processing-first-lab-5-solutions.pdf
    • http://riverside-resort.net/1/solutions-progress-test-unit-1.pdf
    • http://riverside-resort.net/1/the-gardener-the-grill-the-bounty-of-the-garden-meets.pdf
    • http://riverside-resort.net/1/ther-ex-clinical-pocket-guide.pdf
    • http://riverside-resort.net/1/toyota-aygo-owners-manual.pdf
    • http://riverside-resort.net/1/tafseer-para-amma-a-u.pdf
    • http://riverside-resort.net/1/sony-dsr-20-manual.pdf
    • http://riverside-resort.net/1/t-mobile-shadow-user-manual.pdf
    • http://riverside-resort.net/1/stoichiometry-problems-mass-to-mass-with-answers.pdf
    • http://riverside-resort.net/1/to-be-a-jew-guide-to-jewish-observance-in-contemporary-life.pdf
    • https://ourpastimes.com/troubleshooting-ignition-problems-mercury
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://assets.fluke.com/appnotes/electricalpower/B0271b_u.pdf
    • https://forums.iboats.com/Mercury-Outboards/Troubleshooting
    • https://forums.iboats.com/Mercury-Outboards/Ignition
    • https://www.youtube.com/watch?v=MDbvkFM1V_c
    • http://go.microsoft.com/fwlink/?LinkID=617350
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://youtu.be/juhri_NxQcQ
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c7c.bin
64854793ce3cd6f2af543ed9c894dafebc16c20370d9c42ec5977d4644ccb6e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7C 13860 bytes
font_01_sfnt_off0000a709.bin
c46fc4e6a2047204d8d00738dcf4e751634c565009e9060eb9dea3810274841d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA709 7876 bytes

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