Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec50e95d17ee6394…

MALICIOUS

PDF

27.7 KB Created: 2018-06-11 08:25:18 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 31ec3412a409d8a9a70517bb3c3799f5 SHA-1: afaa170d327ad0ab57f7eb859b744a5c07f30d4b SHA-256: ec50e95d17ee639495633ec060f1d702e82266fbf3a69d2d489e5ad19efee73a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by an ML classifier as malicious. It contains embedded URLs pointing to potentially malicious download locations, such as http://uncpbisdegree.com/download3.php?q=sleepover-stakeout-sleuth-or-dare-2-kim-harrington.pdf. The document body also contains similar URLs and text that suggests a download lure, reinforced by the 'SE_DOWNLOAD_BUTTON' heuristic. No scripts were extracted, but the overall structure and heuristics indicate a likely attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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=sleepover-stakeout-sleuth-or-dare-2-kim-harrington.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sleepover-stakeout-sleuth-or-dare-2-kim-harrington.pdfIn PDF document text
    • http://riverside-resort.net/1/the-leap.pdfIn PDF document text
    • http://riverside-resort.net/1/ssc-board-geometry-question-paper-2018.pdfIn PDF document text
    • http://riverside-resort.net/1/small-motor-graders-for-sale.pdfIn PDF document text
    • http://riverside-resort.net/1/stop-reading-self-help-books.pdfIn PDF document text
    • http://riverside-resort.net/1/the-traveler-six-artists-from-taiwan.pdfIn PDF document text
    • http://riverside-resort.net/1/the-mission-of-god-unlocking-bibles-grand-narrative-christopher-jh-wright.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-a-first-course-in-probability.pdfIn PDF document text
    • http://riverside-resort.net/1/the-year-in-san-fernando.pdfIn PDF document text
    • http://riverside-resort.net/1/stand-alone-ust-study-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/subaru-forester-fuse-box-97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000031c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C8 10412 bytes
SHA-256: 9ad70c7cb2c70603faa3bda7691a476ba960a4edb2ca2babbabaad798d379d7e
font_01_sfnt_off000052c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52C3 7316 bytes
SHA-256: 99d7a82f97aeafd4d1f9a833bf83d9df152dda67ceff05fb1c02b2dd8066951b

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