Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b5b716e8041a23…

MALICIOUS

PDF

30.6 KB Created: 2018-06-11 08:22:34 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 1618ef2c7f18f8677d59e2793d34b5f9 SHA-1: fb52f2941c342680f3c2f6e953ee3bc358a6cbbd SHA-256: 59b5b716e8041a23f0f7c2e1f7998c6d7fae3ab138fcc8f33b040ae0c7bd62c3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to external resources, likely intended to trick the user into downloading further content. The ML classifier flagged this PDF as malicious with high confidence. The document body and heuristics suggest a lure related to academic materials, specifically trigonometry and geometry answers, to encourage a download. No scripts were extracted, limiting the analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9525

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=topical-review-company-trigonometry-answers.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=topical-review-company-trigonometry-answers.pdfIn PDF document text
    • http://www.topicalrbc.com/geometry-workbook-common-core-hard-copy-answer-key-january-2018-edition/In PDF document text
    • http://www.topicalrbc.com/geometry-workbook-common-core-january-2018-edition/In PDF document text
    • https://www.thehomeschoolmom.com/homeschool-curriculum-reviews/analytical-grammar/In PDF document text
    • https://www.thehomeschoolmom.com/homeschool-curriculum-reviews/growing-with-grammar/In PDF document text
    • http://www.geneanum.com/tunisie.htmlIn PDF document text
    • http://riverside-resort.net/1/walking-the-munros-vol-1-southern-central-and-western-highlands-british-mountains.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-ps3-repair-guide-files.pdfIn PDF document text
    • http://uncpbisdegree.com/1/singapore-math-pacing-guide-for-second-grade.pdfIn PDF document text
    • http://riverside-resort.net/1/user-guide-html-template.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-lt125-quad-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-forbidden-parapsychology.pdfIn PDF document text
    • http://uncpbisdegree.com/1/shadow-grail-1-legacies.pdfIn PDF document text
    • http://uncpbisdegree.com/1/survey-of-accounting-warren-6th-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/straighterline-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-cambridge-introduction-to-shakespeare-comedies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.tes.com/teaching-resource/trigonometry-topic-review-11737653In PDF document text
    • https://www.tes.com/teaching-resource/trigonometry-summary-poster-11583532In PDF document text
    • http://byui.edu/online/course-listIn PDF document text
    • http://byui.edu/online/onlineIn PDF document text
    • https://en.wikipedia.org/wiki/United_States_Academic_DecathlonIn 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_off00003bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BFF 10696 bytes
SHA-256: cf7ca9fb774179ce1dba9bf5c35cbd5b1b3c00c975df5e7c8886aac0949e1361
font_01_sfnt_off00005dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC3 7072 bytes
SHA-256: fadb0ab34c1c3ef116e01f5cb2090cc5f1cdfc164533f6f21113395e0cefabe8

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