Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa50e9005be73ea…

MALICIOUS

PDF

46.2 KB Created: 2020-08-09 17:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0e4b9f6509bde8e8dc32b0dd2ec2305 SHA-1: d5c78d44690e553c72b234f8ca947d2889e203de SHA-256: 3fa50e9005be73eaeab5a65a447f7682bd4f24456482cbb4dbe69728d61bc33a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.ru/pify?keyword=adjective+phrase+explanation+pdf, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains references to the redirector and other PDF files hosted on various domains, suggesting a link farm or redirection scheme designed to lead users to malicious content.

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/pify?keyword=adjective+phrase+explanation+pdf
    • http://bokolix.usedlicense.net/uploads/1/3/1/3/131379678/bidaroberefipuw.pdf
    • http://files.taylormorrismusic.com/uploads/1/3/2/8/132814050/xabulajowe.pdf
    • http://tupum.rutilawashburnancestry.com/uploads/1/3/1/6/131637257/zotizivoxuduzur-difijapuwa-xuralutosoxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/dragon_quest_characters_torneko_no_daibken_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/mabibunipewuzaloburevuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/xofowepu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/bugisawevuvazulixojares.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/66898423322.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9230/files/kuvadowojoxases.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/nagifukewunevagifotaxixim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2935/files/zetuxazozebaj.pdf
    • https://cdn.shopify.com/s/files/1/0448/4985/6669/files/bsc_hons_physics_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/calculus_with_analytic_geometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/55678124202.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_off0000766f.bin
eebf52f4b3b578f95c21f2bf84b8ead97f54edec63885694b03c1753bd5d5e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 5436 bytes
font_01_sfnt_off000088fc.bin
164d87edc74c7e8a96059068b2db23558ae96238e036215d39207b13404f423f
pdf-font-stream PDF embedded font (sfnt) at offset 0x88FC 10244 bytes