Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c7c9a3ac67dc63…

MALICIOUS

PDF

28.2 KB Created: 2018-06-11 09:42:31 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 90006ceae435bd6da63669fe22f1f571 SHA-1: 748b9a91b4ab454f40145e29d444f7cbfb98de3b SHA-256: 39c7c9a3ac67dc63f66ee6812e49fd4e92d71a120f780bd326bcc25d3f0c09ab
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=waec-2015-geography3-and-answer.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=waec-2015-geography3-and-answer.pdfIn PDF document text
    • http://riverside-resort.net/1/universal-remote-control-r6-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/shadow-man-smoky-barrett-1-cody-mcfadyen.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-dc-comics-guide-to-pencilling-download.pdfIn PDF document text
    • http://riverside-resort.net/1/university-of-westminster-fees.pdfIn PDF document text
    • http://riverside-resort.net/1/user-guide-for-motorola-bravo-mb520.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-antenna-theory-ebook.pdfIn PDF document text
    • http://riverside-resort.net/1/used-go-kart-motor.pdfIn PDF document text
    • http://uncpbisdegree.com/1/smart-car-logo-design.pdfIn PDF document text
    • http://riverside-resort.net/1/worth-forgiving-mma-fighter-book-3.pdfIn PDF document text
    • http://uncpbisdegree.com/1/staar-reading-question-stems-4th-grade-kilgo.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_off000030ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EE 10760 bytes
SHA-256: d505df3a8157923ae8ad79cca4f4e3bf437cec028a32d5d68f33de1103872cee
font_01_sfnt_off000052c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52C4 7928 bytes
SHA-256: 3ad5eee3417db40ea531ea150dba39ea366956d0323aff5eaf982ee95377db9b