Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe9187cd48977c2…

MALICIOUS

PDF

30.1 KB Created: 2018-06-11 09:14:32 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: aaae4e2dfbba940506466268efc0cc5c SHA-1: ff39b30de06430b7552381175fff686af973d479 SHA-256: cbe9187cd48977c24454694da5b2d5a4190e5909e12df2be11191f8e46aae592
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded URLs that point to a domain associated with malicious activity. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, includes references to the URLs and suggests a lure to download a file, likely to deliver a secondary payload. The presence of a 'download button' heuristic further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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-fullness-of-god-frithjof-schuon-on-christianity-writings-of-frithjof-schuon.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-fullness-of-god-frithjof-schuon-on-christianity-writings-of-frithjof-schuon.pdfIn PDF document text
    • http://www.worldwisdom.com/public/authors/Frithjof-Schuon.aspxIn PDF document text
    • http://www.worldwisdom.com/public/authors/default.aspx?Display=AuthorsIn PDF document text
    • http://www.gnosis.org/gnostic-jung/The-Gnostic-Jung.htmlIn PDF document text
    • http://uncpbisdegree.com/1/teacher-solutions-manual-for-practical-business-statistics.pdfIn PDF document text
    • http://riverside-resort.net/1/world-general-knowledge-questions-and-answers-2013.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-haunted-mask-ii-goosebumps.pdfIn PDF document text
    • http://riverside-resort.net/1/user-manual-blaupunkt-car300.pdfIn PDF document text
    • http://uncpbisdegree.com/1/student-exploration-answers-dichotomous-keys.pdfIn PDF document text
    • http://uncpbisdegree.com/1/test-study-guide-port-authority-general-maintainer.pdfIn PDF document text
    • http://riverside-resort.net/1/volkswagen-golf-7-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-hidden-target-helen-macinnes-library.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-great-gatsby-exam-ucps-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/share-ebook-cognitive-behavioural-therapy-for-dummies-repost-mediafire-link.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/GnosticismIn PDF document text
    • https://en.wikipedia.org/wiki/Friedrich_NietzscheIn 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_off00003a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A6B 10412 bytes
SHA-256: 7f06de0d3de9117c68928814e8cc0fbbfe9a8529db58dc950e86999722f5e78c
font_01_sfnt_off00005b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8A 7356 bytes
SHA-256: 73618713834124c23ef2bfea0a56abe675c33e341f85ed7089ebfaca9cba328b

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