Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2a14ca57183fe5…

MALICIOUS

PDF

27.5 KB Created: 2018-06-11 08:46:28 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6f496a49b0e2bf7ccf9a3b429fc041ca SHA-1: 54e32b7308709bf407d529c2f951312759948e6e SHA-256: ba2a14ca57183fe5faba97cc0928bfa082d8522405c08196f9d9bb20db2bdeaa
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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=volvo-md2-diesel-wiring-diagram.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=volvo-md2-diesel-wiring-diagram.pdfIn PDF document text
    • http://burnscamp.org.uk/6/3/becoming-visible-in-iran-women-in-contemporary-iranian-society.pdfIn PDF document text
    • http://www.oldmarineengine.com/discus/messages/3/101023.htmlIn PDF document text
    • http://riverside-resort.net/1/stalker-moving-radar-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/split-pin-paper-characters.pdfIn PDF document text
    • http://riverside-resort.net/1/stihl-fe-55-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/to-life-eco-art-in-pursuit-of-a-sustainable-planet.pdfIn PDF document text
    • http://riverside-resort.net/1/team-handbook-peter-scholtes.pdfIn PDF document text
    • http://riverside-resort.net/1/the-plague-of-doves-a-novel.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-manual-for-wackerly-mendenhall.pdfIn PDF document text
    • http://riverside-resort.net/1/siemens-washing-machine-user-manual-xlp1400.pdfIn PDF document text
    • http://riverside-resort.net/1/the-last-carousel.pdfIn PDF document text
    • http://riverside-resort.net/1/the-ghost-in-the-little-house-a-life-of-rose-wilder-lane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In 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_off00003227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3227 10024 bytes
SHA-256: dfd3df9eacf2581e87b7114f4c691072bf011c1d2f7a55fd45e5e044577f1bba
font_01_sfnt_off00005208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5208 7156 bytes
SHA-256: 30692d4f91c8b8de7a62429cab5f8135dd9fae8573eaf913bfb0cbd7a98bf641