Malicious PDF — malware analysis report

Static analysis result for SHA-256 5915d4529c3a590a…

MALICIOUS

PDF

28.2 KB Created: 2018-06-11 09:50:48 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b6c95574075718e099669fc18fd7db14 SHA-1: ace1e2194a3d67422bfa3d15d91a591bffb0a862 SHA-256: 5915d4529c3a590a113f685bcb8f27b1545f16e50a2a7f624abbe596c4df6e07
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains an embedded URI pointing to 'uncpbisdegree.com', which is flagged as suspicious. The ML classifier also identified this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a file. No scripts were extracted, limiting the ability to determine the exact payload or persistence mechanisms.

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.
  • 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=vajrayana-and-women-machig-labdr-n-yeshe-tsogyal-mandarava.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=vajrayana-and-women-machig-labdr-n-yeshe-tsogyal-mandarava.pdfIn PDF document text
    • http://riverside-resort.net/1/the-23rd-psalm-a-holocaust-memoir.pdfIn PDF document text
    • http://riverside-resort.net/1/sex-and-the-kitty.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-for-convex-optimization-boyd.pdfIn PDF document text
    • http://riverside-resort.net/1/trump-views-on-abortion.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-camry-conquest-engine-repair-manual-1999.pdfIn PDF document text
    • http://riverside-resort.net/1/the-monster-in-hollows-wingfeather-saga-3-andrew-peterson.pdfIn PDF document text
    • http://riverside-resort.net/1/sunrise-credit-union-weekly-payroll-excel-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/traditional-buildings-of-india.pdfIn PDF document text
    • http://riverside-resort.net/1/thermal-engineering-1-question-paper-in-dme.pdfIn PDF document text
    • http://riverside-resort.net/1/the-silk-road-in-world-history.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_off00003280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3280 10656 bytes
SHA-256: 7135013a9f030a0a2f269cab256db154d2ccdc2a37a30448069c650b7e84ecad
font_01_sfnt_off0000542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542E 7424 bytes
SHA-256: 31f4babdcd02462af9df2c64a404730c42128b101223734b4c3a69f3dad3e243

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