Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf0466a1ae5a90b…

MALICIOUS

PDF

27.4 KB Created: 2018-06-11 08:41:58 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 220dc41d9564298b6883fb95471e3b03 SHA-1: 097f3893c4be6b6f6ed2dadbbe49e4f4bf8318dc SHA-256: dcf0466a1ae5a90beb4b1a64738bbac381f9906b944c0d279c9a3298f62cf6fb
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded URLs pointing to potentially malicious download locations, disguised as workshop manuals. The ML classifier strongly flagged this PDF as malicious. The presence of a visual download button heuristic further supports a lure-based attack. No scripts were extracted, but the overall structure and embedded URLs indicate a likely attempt to deliver a malicious payload or phish for credentials.

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=sisu-diesel-fortius-series-engines-workshop-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sisu-diesel-fortius-series-engines-workshop-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/teacher-answer-book-caves-and-caving-in-davely-dale.pdfIn PDF document text
    • http://riverside-resort.net/1/selected-poems-langston-hughes.pdfIn PDF document text
    • http://riverside-resort.net/1/student-exploration-cell-energy-cycle-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/subaru-forester-factory-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/un-brindis-por-el-amor.pdfIn PDF document text
    • http://riverside-resort.net/1/true-blood-episode-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/the-pansy-garden-a-novel.pdfIn PDF document text
    • http://riverside-resort.net/1/swift-analysis-aptitude-practice-tests.pdfIn PDF document text
    • http://riverside-resort.net/1/south-african-learners-licence-test-questions-and-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/the-abcs-of-animals-abcs-of-the-natural-world.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_off00003214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3214 9940 bytes
SHA-256: 16496987afd9fddf90e96ae85af8d0f52012b2f52060e4c5650e577eea2a5c05
font_01_sfnt_off000051a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A4 7216 bytes
SHA-256: 5e396f47b754404c0e66f9b93aabed1000ba097953c3aabcb874580183830d57

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