Malicious PDF — malware analysis report

Static analysis result for SHA-256 116cef4973dfd1b2…

MALICIOUS

PDF

74.0 KB Created: 2021-01-11 08:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3643c729d840bfbe2800a9e9ca562198 SHA-1: c95fb6f68791472bf9d38433ff9a9833353ac7b6 SHA-256: 116cef4973dfd1b2daa24ab9083f6374480c268b5970e46fe1c7cb598b958293
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to disposable hosting or redirector services, suggesting a link farm or phishing lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'traffine.ru' which is associated with malicious redirector infrastructure. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, but the presence of many links indicates an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffine.ru/wb?keyword=dhoom%202%20hrithik%20roshan%20dance In PDF document text
    • https://site-1177701.mozfiles.com/files/1177701/dovilapom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5fede85d39071.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/dojofunisufaji.pdfIn PDF document text
    • https://site-1168358.mozfiles.com/files/1168358/fubopemataxavufavaj.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/hjcdoif/arcade_space_shooter_games_list.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/tales_of_crestoria_anime_wikipedia.pdfIn PDF document text
    • https://site-1197344.mozfiles.com/files/1197344/6077426500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5fabfed9bc4ae.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/background_eraser_tool_online_free_high_resolution.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/xowab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f89d2116eef7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 5340 bytes
SHA-256: 02b421b502e3d0efc1b3bc5ce20f047045990108a235afbf85ad32ec59fe8a26
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10420 bytes
SHA-256: 649f89c5835800790445167733146cec96475810dbcf117d194cac388460d020

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