Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddaf0aa004cf964…

MALICIOUS

PDF

28.0 KB Created: 2018-06-11 09:10:39 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-15
MD5: ecc7958224c0fbbb9e09f939ea9799be SHA-1: 5540eac1b4f222ad609ccbb914342608d3ed2d23 SHA-256: 8ddaf0aa004cf9648e80ecefc9515f256e649746a60914a01181c5fdd2a1db36
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains an embedded URI pointing to a suspicious domain, which was also flagged by an ML classifier. The document body includes multiple links to the same suspicious domain, suggesting a download lure. No scripts were extracted, and the primary threat appears to be the redirection to malicious content via the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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=wikipedia-a-new-community-of-practice.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=wikipedia-a-new-community-of-practice.pdfIn PDF document text
    • http://uncpbisdegree.com/1/servo-motor-applications-ppt.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-coaches-little-playbook.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-complete-photo-guide-to-perfect-fitting-sarah-veblen.pdfIn PDF document text
    • http://riverside-resort.net/1/volumat-mc-agilia-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/vinyl-cafe-diaries-stuart-mclean.pdfIn PDF document text
    • http://riverside-resort.net/1/world-history-of-photography-naomi-rosenblum.pdfIn PDF document text
    • http://uncpbisdegree.com/1/september-2018-physical-science-kzn.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-jeep-grand-cherokee-laredo-96.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-colonial-wars.pdfIn PDF document text
    • http://riverside-resort.net/1/weygandt-accounting-principles-9th-edition-answers.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/Community_of_practiceIn PDF document text
    • https://en.wikipedia.org/wiki/CommunityIn 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_off00003472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3472 10332 bytes
SHA-256: e41af39197cf118f61e9bb13d787499635d0ef81b91ea5bf81fd8571237e79e8
font_01_sfnt_off00005519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5519 6696 bytes
SHA-256: 064aeb7b8bf4635a966b204dd54e6e20ff6eacdc888f40199ccc2f88bd404c82

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