Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29bcdd43b046395…

MALICIOUS

PDF

28.5 KB Created: 2018-06-11 09:33:33 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 89fbf626644d53e630dfbf7039d84a99 SHA-1: 3a08a35b90bfc6d693a6785a8fb247e2037d6ccb SHA-256: a29bcdd43b0463953f6580ed5f398b6580076152d875697813a0e5646fb0f7c7
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9605

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-icecutters-daughter-land-of-shining-water-book-1.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-icecutters-daughter-land-of-shining-water-book-1.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-dark-realm.pdfIn PDF document text
    • http://riverside-resort.net/1/walther-c99-compact-co2-gun-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/vocabulary-workshop-enriched-edition-level-f-unit-1-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/wordly-wise-3000.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-hangmans-song-inspector-mclean-3-inspector-mclean-mystery.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-ghost-of-marchmont-hall-the-imogen-and-hugh-croft-mysteries-book-6.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-honda-225hr-outboard.pdfIn PDF document text
    • http://uncpbisdegree.com/1/spanish-2-expresate-answer-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-motorcycles-canada-2018.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-color-of-water-chapter-questions.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_off0000328a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328A 11044 bytes
SHA-256: 29903fe0ea12c501697c10bec5a6068ac59c77be8b4125806cb7e6877aade991
font_01_sfnt_off0000553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553D 7504 bytes
SHA-256: e947f55f3753891ff9a564b8cba59c6dd59d3bfe5d2b75ce7d26d2396b635013