Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b608e15c973f68…

MALICIOUS

PDF

68.7 KB Created: 2020-12-24 20:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f70ad55c9dc6a015e002a78a085ec1a SHA-1: ea0bebbd997d4307437a52a1e4ee3ba5a1444f44 SHA-256: 59b608e15c973f68dc90ca4f723575561cb73883013ae3eff8b581e6ad1408ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of external links, indicating a potential link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of numerous URLs suggests an attempt to redirect the user to potentially harmful websites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafftec.ru/123?utm_term=persona+3+empress+arcana
    • https://cdn.sqhk.co/makafabakuna/igjhig4/24125558002.pdf
    • https://cdn.sqhk.co/varaxupumami/dhbU0jh/froberg_farm_train_accident.pdf
    • https://cdn.sqhk.co/pekebugus/Chdghgf/globe_prepaid_call_promo_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fb5c1a2e6a84.pdf
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fae01c1c407f.pdf
    • https://cdn.sqhk.co/javufikari/gcidb6h/14755962542.pdf
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fb255b6c4e08.pdf
    • https://static.s123-cdn-static.com/uploads/4490122/normal_5fe0e34c04bbb.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f87ecf5e498f.pdf
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/b77090adf7070.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ginutu/vilebi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c9.bin
01cfc658386f93df24f04aca022d3227957fb25603ad4a91e7e53c9bb7a8828e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 5212 bytes
font_01_sfnt_off0000e26c.bin
078a9b69f7010ece10daede649a067aa2f597626b7281eccf1ab3b51ab8aa821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10576 bytes

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