Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dd8799462b746e…

MALICIOUS

PDF

32.0 KB Created: 2018-06-11 08:19:13 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 49a82d5de8ee1f4a15b58407b3fdc511 SHA-1: c9f4067bca2654a1e0dcc8eeef06d621ac4c9a03 SHA-256: 28dd8799462b746ed5e175356b09400080891cc136f1379be2c0551a662a8434
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9497

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=spanish-2-workbook-page-84-answers.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=spanish-2-workbook-page-84-answers.pdfIn PDF document text
    • http://www.slader.com/textbook/9780130360021-practice-workbook-2/In PDF document text
    • http://www.slader.com/textbook/9780673216823-paso-a-paso-workbook-2/In PDF document text
    • http://www.phschool.com/In PDF document text
    • http://mendycolbert.com/Spanish1.htmIn PDF document text
    • http://www.classzone.com/In PDF document text
    • http://www.kingspizzaonladson.com/200-honda-rancher-manual.pdfIn PDF document text
    • http://www.unitedstates-history.org/19/to/1993-toyota-camry-repair-manual-chassis-body-electrical-volume-2.pdfIn PDF document text
    • http://thepigroup.com/PPO.htmlIn PDF document text
    • https://allinonehomeschool.com/math-2-2/In PDF document text
    • http://riverside-resort.net/1/zimsec-2018-papers-which-had-licked.pdfIn PDF document text
    • http://uncpbisdegree.com/1/software-engineering-by-ian-sommerville-ebook-free-download.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stihl-chainsaw-parts-diagram-009-l.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-bill-of-rights-today-constitutional-limits-on-the-powers-of-government.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-blackthorn-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/shop-vac-962-55-10-vacuums-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-enchanted-lenormand-oracle.pdfIn PDF document text
    • http://riverside-resort.net/1/yamaha-automobile-manuals.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stage-4-pancreatic-cancer-life-expectancy.pdfIn PDF document text
    • http://riverside-resort.net/1/www-mcb-online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.mnsu.edu/comdis/kuster2/sptherapy.htmlIn PDF document text
    • http://www.who.int/sorry/en/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_off00003eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EEC 10628 bytes
SHA-256: 8178a76578263377177c9cccee1ba3ab7b9bea4ba80589dc3c01b02eb36eb7bb
font_01_sfnt_off0000609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 7976 bytes
SHA-256: b1d2c182bada744a527cc33fd095785f10256a228fe958fe3e28c3b991c2da9c