Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af2182f6957ca20…

MALICIOUS

PDF

33.2 KB Created: 2018-06-11 08:59:54 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: e92ec66be56a682b4a7640bd8150a045 SHA-1: dc56330adc54c2f074ba91dec6034609aa5f6eb4 SHA-256: 2af2182f6957ca2007f3f072889584bc426f813eff705d1053c654633614c3a7
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded links and a heuristic firing for a visual download button, suggesting a lure to download further content. The ML classifier also flagged this PDF as malicious with high confidence. The primary malicious URLs identified are related to downloading a Yamaha outboard motor manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9161

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-130hp-2-stroke-outboard-motor-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=yamaha-130hp-2-stroke-outboard-motor-manual.pdfIn PDF document text
    • http://www.outboardrepairsmanual.com/yamaha-outboard-carburetor-tuning-and-adjustment.htmlIn PDF document text
    • https://www.911manual.com/download-yamaha-outboard-manuals/In PDF document text
    • http://www.instant-manual.com/DOWNLOAD_1995-2006_Yamaha_Outbard_Service_Manuals_.htmlIn PDF document text
    • http://www.megalawbooks.com/2017-honda-four-stroke-15-hp-outboard-service-manual.pdfIn PDF document text
    • http://www.instant-manual.com/Download_Marine_Engine_Service_Manuals_By_Brand.htmlIn PDF document text
    • http://www.lecoqshabille.com/1980/1980-25hp-mercury-outboard-service-manual.pdfIn PDF document text
    • https://marine-parts.co.uk/In PDF document text
    • http://continuouswave.com/ubb/Forum4/HTML/005011.htmlIn PDF document text
    • http://www.fishingandboats.com/boat-forum.htmlIn PDF document text
    • http://riverside-resort.net/1/sony-turntable-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/tesccc-function-applications-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/trailer-backup-guide-rod.pdfIn PDF document text
    • http://riverside-resort.net/1/so-this-is-permanence-joy-division-lyrics-and-notebooks.pdfIn PDF document text
    • http://riverside-resort.net/1/time-table-2018-advanced-level.pdfIn PDF document text
    • http://riverside-resort.net/1/speed-worksheets-with-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/stem-cell-controversy-pros-and-cons.pdfIn PDF document text
    • http://riverside-resort.net/1/stage-four-cancer-symptoms.pdfIn PDF document text
    • http://riverside-resort.net/1/the-rise-of-eratz-capitalism-in-sout-east-asia.pdfIn PDF document text
    • http://riverside-resort.net/1/the-silver-spoon-clelia-donofrio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.ebay.com/bhp/yamaha-150-outboardIn PDF document text
    • https://www.boats.net/catalog/yamaha/outboard-by-year/2001In PDF document text
    • https://www.boats.net/catalog/yamaha/outboard-by-year/2002In PDF document text
    • https://www.kijiji.ca/b-ontario/9.9-honda-outboard/k0l9004In PDF document text
    • https://www.kijiji.ca/h-ontario/9004In PDF document text
    • https://www.gumtree.co.za/s-lowrance+fishfinder/v1q0p1In PDF document text
    • https://www.kijiji.ca/b-ontario/trophy-boat/k0l9004In PDF document text
    • https://www.gumtree.co.za/s-boat+engines+for+sale/page-4/v1q0p4In 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_off00004546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4546 10056 bytes
SHA-256: 9ab70c28fa27c3aafffb21844fd7cfaafb845cb10947747928ac9ac73b6ec8e0
font_01_sfnt_off00006558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6558 7816 bytes
SHA-256: df104521e228e7d5a6f7bcf5872aae6ddbf61f065b17d7bf2bcfae6ae31aaa51