Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc4a1f2707cc212…

MALICIOUS

PDF

30.1 KB Created: 2018-06-11 09:03:29 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: a80619516f9d7fdd48d1f34049cf21e6 SHA-1: b8435607c94fe68d1385380b38534ef4cfe5554b SHA-256: fbc4a1f2707cc212fee64413a905d99a9cf3fc2e070e9c111851a634cc6d0be2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded URLs pointing to suspicious domains, suggesting a download lure. The ML classifier flagged this PDF as malicious with high confidence. The document body, though partially garbled, includes references to download URLs and appears to be designed to trick users into clicking them. No scripts were extracted, limiting the analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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-vedanta-sutras-with-the-commentary-by-ramanuja-part-3-1st-reprint.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-vedanta-sutras-with-the-commentary-by-ramanuja-part-3-1st-reprint.pdfIn PDF document text
    • http://riverside-resort.net/1/supreme-court-case-studies-mcgraw-hill-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/sources-for-english-local-history.pdfIn PDF document text
    • http://riverside-resort.net/1/technical-manual-for-larson-sei-180.pdfIn PDF document text
    • http://riverside-resort.net/1/special-treasures-harlequin-superromance-no-353.pdfIn PDF document text
    • http://riverside-resort.net/1/synopsis-of-oral-and-maxillofacial-surgery-an-update-overview-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-usa-1917-45-heinemann-advanced-history.pdfIn PDF document text
    • http://riverside-resort.net/1/tally-9-manual-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/tropical-storm-cindy-radar.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-kds-r60xbr2-tvs-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/solving-linear-systems-algebraically-key-tesccc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/AdvaitaIn PDF document text
    • https://en.wikipedia.org/wiki/SutraIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3760 11300 bytes
SHA-256: ec7c0134ee6ceaf8ef7f98815f525a7d8a0a6101bee7dc36dabe037bde6dde5c
font_01_sfnt_off00005adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADC 7608 bytes
SHA-256: 0e27ffd0de3d206da976e58c2d7c6741f3241239f21cfacdf3d27b3a60ecb7f6

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