Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bbcf687f02d7fd…

MALICIOUS

PDF

29.3 KB Created: 2018-06-11 09:00:03 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 77e34f9a09ded732406b0f75f8826605 SHA-1: 8d330f9bcee2a106d75444d2fa0e0f9a0e24d7f8 SHA-256: c6bbcf687f02d7fd8616a606901e834ad9a858f616e6980da13262a2d5dc4b06
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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=toyota-corrolla-1990-starter-diagram.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=toyota-corrolla-1990-starter-diagram.pdfIn PDF document text
    • http://www.oldclassiccar.co.uk/modernads_make/toyota.htmIn PDF document text
    • http://uncpbisdegree.com/1/smc-smc6750l2-switches-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/x-men-the-hidden-years-vol-2.pdfIn PDF document text
    • http://uncpbisdegree.com/1/staar-answer-sheet-bubble.pdfIn PDF document text
    • http://uncpbisdegree.com/1/study-phd-in-uk.pdfIn PDF document text
    • http://uncpbisdegree.com/1/surgical-mesh-problems.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-bravia-tv-guide-not-working.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-for-a-crown-wp-2300.pdfIn PDF document text
    • http://uncpbisdegree.com/1/teaching-transparency-master-answers-worksheet-13.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-fundamentals-of-thermodynamics-7th-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/social-services-interview-questions-answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.cargurus.com/Cars/Discussion-t16958_ds539437In PDF document text
    • https://www.cargurus.com/Cars/questions/In PDF document text
    • https://www.cargurus.com/Cars/questions/Subaru-Questions-qt40In PDF document text
    • https://www.cargurus.com/Cars/questions/Subaru-Forester-Questions-qt1353In 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_off00003522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3522 11076 bytes
SHA-256: 385dba1ec16ddae92ccba7f7cc303e92b8ad04756f439c329fc369dd90c4a9f8
font_01_sfnt_off000057e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E9 7544 bytes
SHA-256: da7e529184afdcfd12f45800bcdf2926542db7aa17a6a3fda5df2fd1d9701583