Malicious PDF — malware analysis report

Static analysis result for SHA-256 242055e6871e2d42…

MALICIOUS

PDF

35.6 KB Created: 2020-09-01 03:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5da31b452d23b8c7604ae10a68fab45 SHA-1: f30cb180a68557441a62548714b922028eaeffa4 SHA-256: 242055e6871e2d426be9cfd4e7014c73b682f6764afc3356891898c383cf0425
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a search result for educational content. The document also includes a large number of links to other PDFs hosted on Shopify, likely as part of an SEO poisoning or link farm tactic to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://ttraff.ru/wix?keyword=english+morphology+exercises+with+answers+pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/cannibal_holocaust_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/33483684012.pdf
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/11807297677.pdf
    • https://cdn.shopify.com/s/files/1/0459/5770/9983/files/the_master_kresley_cole_goodreads.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/lesakapumidefuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/83781855994.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/kafidegadedubamutogipov.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/fiwakozusekus.pdf
    • https://static.usrfiles.com/ugd/a640e9_b838eb3e24e94a489db2a04610dd3629.pdf
    • https://static.usrfiles.com/ugd/f3cb45_bcce49377d28408ebbf34f327c8548ce.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/76766549710.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/calculus_early_transcendentals_10th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomuburisuxenogiduta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004be6.bin
2c64793cd4a3424b9b772b5d918b43b86bd186586e6980c3bab43ddbdf578999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE6 5788 bytes
font_01_sfnt_off00005f94.bin
79b267fdb58e0f3eaee8d4d5e0209bbc22323ba4f712d0182ddfc2e1f3aa3806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 9996 bytes

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