Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10c4366521a2534…

MALICIOUS

PDF

31.1 KB Created: 2018-06-11 08:29:38 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-07
MD5: bcf68ce1be9c3ec7acef58f5913ab0be SHA-1: 4fd8903a7c4ecc4c56d77efcc35244ec2085afc6 SHA-256: b10c4366521a2534d38bb921896e9a340918f1b0d6b0827d48f3d38c34d61932
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a domain associated with malicious activity. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports the intent to trick the user into downloading a file. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious nature of the content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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=the-christian-theology-reader-alister-e-mcgrath.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-christian-theology-reader-alister-e-mcgrath.pdfIn PDF document text
    • http://www.biblicaltheology.com/Research/MartinezR01.htmlIn PDF document text
    • https://www.onlinechristiancolleges.com/50-best-christian-biographies/In PDF document text
    • http://www.godandscience.org/book_reviews.htmlIn PDF document text
    • https://www.monergism.com/distinction-between-god%E2%80%99s-punishment-and-god%E2%80%99s-disciplineIn PDF document text
    • http://lollardsociety.org/?page_id=10In PDF document text
    • http://www.123helpme.com/search.asp?text=salvationIn PDF document text
    • http://www.onenesspentecostal.com/atonement.htmIn PDF document text
    • http://riverside-resort.net/1/social-science-final-exam-2018-grade9.pdfIn PDF document text
    • http://riverside-resort.net/1/thomas-l-floyd-solution.pdfIn PDF document text
    • http://riverside-resort.net/1/stewart-james-calculus-7e-solutions-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/travel-industry-economics-a-guide-for-financial-analysis.pdfIn PDF document text
    • http://riverside-resort.net/1/top-notch-1-answer-key-grammar-booster.pdfIn PDF document text
    • http://riverside-resort.net/1/the-adventures-of-henry-thoreau-a-young-mans-unlikely-path-to-walden-pond-michael-sims.pdfIn PDF document text
    • http://riverside-resort.net/1/signing-naturally-answer-key-online.pdfIn PDF document text
    • http://riverside-resort.net/1/setting-the-public-agenda.pdfIn PDF document text
    • http://riverside-resort.net/1/thomson-proscan-40ld45q-user-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/social-psychology-8th-edition-quizzes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Alister_McGrathIn PDF document text
    • https://en.wikipedia.org/wiki/Outline_of_Christian_theologyIn PDF document text
    • http://people.bu.edu/wwildman/bce/barth.htmIn PDF document text
    • http://www.openculture.com/2010/08/richard_dawkins_john_lennox_debate_atheism.htmlIn PDF document text
    • https://www.catholicworldreport.com/2017/12/31/the-best-books-i-read-in-2017/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_off00003dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DD9 10792 bytes
SHA-256: 8c8499116b9ac950826092e3efabf039e38c736045dcc73ca608fdfbb8d08f51
font_01_sfnt_off0000601d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 7000 bytes
SHA-256: 2e7fc3ba828cf4b9f702282b695d261ec9d882d12804934ac7fd3c10bb1db26a