Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f411a7270f63e…

MALICIOUS

PDF

45.7 KB Created: 2018-06-11 09:07:10 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 008c8ba48c7c8ecab08faf545aaabd81 SHA-1: ebcfa2db689b0875eaea3b22e7eba58379d217b9 SHA-256: 534f411a7270f63ef937cc8c4b95ebed9b17bc8f07b86fa9a67190213849a7d4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains multiple embedded URLs that mimic download links for a user guide. The ML classifier flagged this PDF as malicious with high confidence. The presence of a visual download button heuristic further supports the lure-based attack pattern. The primary intent appears to be tricking the user into downloading a potentially malicious file disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9227

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=yamaha-ski-boats-user-guide.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=yamaha-ski-boats-user-guide.pdfIn PDF document text
    • http://drlogo.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://giseye.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://hihugo.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://drreis.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://indumo.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://rawest.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://pjozzi.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • https://www.yamahawaverunners.com/In PDF document text
    • http://alkies.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • http://coxrat.de/yamaha/ski/yamaha_ski_boats_user_guide.pdfIn PDF document text
    • https://yamahaboats.com/In PDF document text
    • https://www.yamahaboats.com/24-ft-boats/242-limited-s/In PDF document text
    • http://riverside-resort.net/1/takeover-theresa-maclean-1-lisa-black.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-to-cambridge-unit-4-accounting.pdfIn PDF document text
    • http://riverside-resort.net/1/special-senses-review-sheet-17-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/simplified-icse-chemistry-for-std-ix-54th-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-fragrance-forgotten-years.pdfIn PDF document text
    • http://riverside-resort.net/1/the-rogue-crew-greenshroud.pdfIn PDF document text
    • http://riverside-resort.net/1/the-magic-school-bus-and-the-electric-field-trip.pdfIn PDF document text
    • http://riverside-resort.net/1/system-wiring-diagrams-gm-forum.pdfIn PDF document text
    • http://riverside-resort.net/1/suzuki-boulevard-c109rt-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/ucsd-chemistry-placement-exam-study-guide.pdfIn PDF document text
    • https://www.yamahawaverunners.comIn PDF document text
    • https://yamahaboats.comIn PDF document text
    • https://www.yamahaboats.com/24-ft-boats/242-limited-sIn 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=617350In 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_off00006621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 14320 bytes
SHA-256: e34eee652857bfba576dcc15578f4221bb31b28f4629cab9acddc43001f8edee
font_01_sfnt_off0000919e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919E 9016 bytes
SHA-256: a5eb33db5bf2a966819c29b376c9d90ca664f37b909326e216f133160f05ccc8