Malicious PDF — malware analysis report

Static analysis result for SHA-256 608c79bd49a14e19…

MALICIOUS

PDF

28.6 KB Created: 2018-06-11 09:46:12 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: e9ef467ff46cd6517c2083029e287261 SHA-1: 1470cc28ea7236a9265cd07de8e05affe653e114 SHA-256: 608c79bd49a14e19cc12371af888872fad1e87d4faee1b24adb0ce740d86259d
102 Risk Score

Malware Insights

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

The PDF is identified as malicious by an ML classifier and contains heuristics indicating it's a fake download lure using SEO poisoning. The document body and extracted URLs point to deceptive links designed to trick users into downloading further malicious content, likely disguised as academic materials. The primary malicious URLs are associated with downloading PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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=student-solutions-manual-for-hayters-probability-and-2.pdf
    • http://uncpbisdegree.com/download4.php?q=student-solutions-manual-for-hayters-probability-and-2.pdf
    • http://riverside-resort.net/1/waterco-focus-temp-manual.pdf
    • http://uncpbisdegree.com/1/the-food-and-cooking-of-romania-and-bulgaria-ingredients-and-traditions-in-over-65-recipes.pdf
    • http://riverside-resort.net/1/wise-up-weight-control-solutions-for-fat-burning.pdf
    • http://riverside-resort.net/1/waves-light-and-sound-unit-test-answers.pdf
    • http://riverside-resort.net/1/windows-server-2003-in-a-nutshell.pdf
    • http://riverside-resort.net/1/validating-identity-user-guide.pdf
    • http://riverside-resort.net/1/user-guide-for-motorola-razr-xt910.pdf
    • http://uncpbisdegree.com/1/solution-of-cbse-mathematics-paper-2015.pdf
    • http://riverside-resort.net/1/where-can-get-bece-june-2014-answers.pdf
    • http://uncpbisdegree.com/1/simple-marquetry-techniques-projects-inspirations.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032fa.bin
f35541450a437f5f2d741ddf3b2c8f7e48c3055c08054eaa5fd043b66cb0bf25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32FA 11268 bytes
font_01_sfnt_off0000565f.bin
0c6f03da996478c2fd8d298c3434ffc7300ad5087053ca71a1bdd534f0f02658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565F 7264 bytes

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