Malicious PDF — malware analysis report

Static analysis result for SHA-256 28611cc7e2331060…

MALICIOUS

PDF

28.0 KB Created: 2018-06-11 08:47:17 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 047c577d3f9b28ca2e65c418d6f8a05f SHA-1: ed0e66f7d31aec6216ffa23806daf4e00e803031 SHA-256: 28611cc7e2331060c97419fc092d4ecfd52d0e22efa389d1b28852b1259dea78
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by an ML classifier as malicious and contains heuristics indicating it is a fake download lure designed for SEO poisoning. The document body and extracted URLs point to a deceptive download gateway at 'uncpbisdegree.com', which is likely used to distribute further malicious content.

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=the-adventures-of-huckleberry-finn-clothbound-classics.pdf
    • http://uncpbisdegree.com/download4.php?q=the-adventures-of-huckleberry-finn-clothbound-classics.pdf
    • https://ipsum.im/
    • http://uncpbisdegree.com/1/walter-nicholson-teoria-microeconomica-9-edicion-taringa.pdf
    • http://uncpbisdegree.com/1/yanmar-diesel-engine-operation-manual.pdf
    • http://uncpbisdegree.com/1/the-surrender-of-miss-fairbourne-quartet-1-madeline-hunter.pdf
    • http://uncpbisdegree.com/1/what-is-synvisc-one.pdf
    • http://uncpbisdegree.com/1/unit-8-test-form-a-geometry.pdf
    • http://uncpbisdegree.com/1/tragedy-and-civilization-an-interpretation-of-sophocles.pdf
    • http://uncpbisdegree.com/1/very-ordinary-seaman.pdf
    • http://uncpbisdegree.com/1/toyota-highlander-owners-manual-2003.pdf
    • http://uncpbisdegree.com/1/valentina-picoteada.pdf
    • http://uncpbisdegree.com/1/trolling-motor-speed-controller.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_off0000332d.bin
59407d764795002238e1c4728abb75075cb9ac1336ad7f03c6b9d36597a58fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x332D 10476 bytes
font_01_sfnt_off00005441.bin
f172a33247abe60f82c4ff1c5a5bfd36dbf63f749471dda15c2564dbd86b255c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5441 7156 bytes

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