Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a2343ab37a6caa…

MALICIOUS

PDF

29.3 KB Created: 2018-06-11 09:30:43 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2aaf2b790ba1398139faf0f9a82127db SHA-1: 424ab8d6eb39110e07b56519843e8d24ec947e5c SHA-256: c3a2343ab37a6caa550ea0ecdd81a3c0d2c374c16e3356bd68b5122cd65274a6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains multiple embedded URLs, with a primary focus on uncpbisdegree.com, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. The document body and heuristics indicate a lure related to academic assessment answers, aiming to trick users into downloading a malicious file. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

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=stoichiometry-gizmo-assessment-answers.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=stoichiometry-gizmo-assessment-answers.pdfIn PDF document text
    • https://fullexams.com/exam/student-exploration-circulatory-system-answer-key-pdfIn PDF document text
    • http://burnscamp.org.uk/5/1/pieter-brueghel-zoo-heb-ik-u-uit-uw-werken-geroken.pdfIn PDF document text
    • http://plpnetwork.com/2012/10/08/flip-love-affair/In PDF document text
    • http://riverside-resort.net/1/tuesday-morning-coupons-in-store.pdfIn PDF document text
    • http://riverside-resort.net/1/service-manual-mahindra-3015-hst.pdfIn PDF document text
    • http://riverside-resort.net/1/tet-2-exam-answer-key-2018.pdfIn PDF document text
    • http://riverside-resort.net/1/the-best-of-everything-hockey-book.pdfIn PDF document text
    • http://riverside-resort.net/1/the-women-of-pemberley-a-companion-volume-to-jane-austen-am.pdfIn PDF document text
    • http://riverside-resort.net/1/stoichiometry-review-sheet-answers-chater-8.pdfIn PDF document text
    • http://riverside-resort.net/1/the-darbys-of-coalbrookdale.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-su-w200-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/slick-digital-camera-manuals.pdfIn PDF document text
    • http://riverside-resort.net/1/transitioning-to-california-s-new-commomn-core-math-standards-study-guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.explorelearning.com/In PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off000037f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37F8 10344 bytes
SHA-256: 4e116ec1a16a9e810346ac5f835fa0997268e0b9e88d53658990b209dce4ecae
font_01_sfnt_off000058e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E5 7120 bytes
SHA-256: 2d0654fa0cc44c1ee041b0497b22aa360c7b0bab7506cf0d2700adb998eb7e52

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