Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d253d75db8e3c0a…

MALICIOUS

PDF

73.5 KB Created: 2020-12-19 23:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6aa37d118a6ad5c58ad4a0b7f254cf SHA-1: d3f356d5ec7686df48de021099fecb8c74ba9a3f SHA-256: 5d253d75db8e3c0a599c55bdcce46d14fbbac30a9d41a495857adfaf746050e1
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The embedded URL points to 'cctraff.ru', which is identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the presence of malicious links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=how+soon+can+you+file+a+missing+persons+report
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5fc3e0b57991a.pdf
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd0f3890a639.pdf
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8d818828d6d.pdf
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/130774.pdf
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/4f2e91a9.pdf
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/1130375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81cb51c6-0a59-42a0-8c8f-f40e00f13371/veronica_mars_books_goodreads.pdf
    • https://s3.amazonaws.com/vabedafozo/pivexodoxoluv.pdf
    • https://s3.amazonaws.com/lusabifef/araketu_ao_vivo_1998.pdf
    • https://static1.squarespace.com/static/5fce999a2943451a4d8156ae/t/5fd6d69edca2215260537d11/1607915167157/zumasirilutibalobida.pdf
    • https://s3.amazonaws.com/tezofuretejom/75853466787.pdf
    • https://uploads.strikinglycdn.com/files/3bcae41b-04be-412e-a680-cb5749f44213/shadowrun_5e_chummer.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf92e9d104e5f152d8431/1606220079360/jupaku.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_off0000e121.bin
d1c3a00ab9b4a0d1a4bda000ca828cc844ecb06d563e81b220cc5399a0b90774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 5488 bytes
font_01_sfnt_off0000f3da.bin
5a3a55097440a11b20924b8a58af2900dc3d57ef883dba59b7c23f4ae0615af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 10848 bytes

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