Malicious PDF — malware analysis report

Static analysis result for SHA-256 74df811dc52e5cf4…

MALICIOUS

PDF

62.5 KB Created: 2020-12-24 00:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9fd4c71badd92ca837fd9069f577f3c SHA-1: 4e80118a2474703d57929a7407814aca36cdefa0 SHA-256: 74df811dc52e5cf4eb8f7017902617eaa38b961707ae54b8c922bd9d3933a996
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to setup and potentially lures, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the presence of numerous links to disposable hosting suggests a link farm used for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?utm_term=streamlabs+chatbot+discord+bot+setup
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5fdfc71f05c9b.pdf
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5faf388cadd51.pdf
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/laduwetikeren.pdf
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fb98b4b52403.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/wozuvewi.pdf
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/gazebawuvatako.pdf
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/topuwadimi-xilanudikof.pdf
    • https://sutudaxete.weebly.com/uploads/1/3/4/4/134497902/butaxafaxe.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5fd79a303ac24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0c7feba-18ad-41fc-88f4-19e8e268c7e1/bmw_x5_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/6c258cb5-ecba-4286-bcbc-7de84498c453/the_challenge_2020_episodes.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_off0000b847.bin
30ff689d1fb0e006a12f2c9f7166c106014e06b0817d905f33d9fa6cdbd71de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB847 5556 bytes
font_01_sfnt_off0000caf4.bin
3a689a401f82f8eda5388ae28ce5cb95b07bd5be4b5d93c4d3ef82e44fa870a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 10028 bytes

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