Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7867db10be4807…

MALICIOUS

PDF

58.6 KB Created: 2020-11-25 08:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f49de05d0824034269c59d0c9ecc1b7 SHA-1: 20518677b8ae70a45360a5d092ec54f4ad71955d SHA-256: cb7867db10be48072ab07c95f2c0911ea7fba0ff4c26bf0b19750c019220377c
214 Risk Score

Malware Insights

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

This PDF was flagged by multiple critical heuristics, including a malicious redirector link and a PDF link farm. The ML classifier also gave a high score. The primary malicious URL identified is https://traffmen.ru/strik?utm_term=beer+pong+unblocked+games+66, which likely serves as a gateway to a larger network of malicious or SEO-manipulated content. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its direct user-facing purpose beyond the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=beer+pong+unblocked+games+66
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fb3f90ed1e2c.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/zofolavumot.pdf
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fb29851551b5.pdf
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/zurewib_bureduzogazeza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/duzexefemosaxe/north_dallas_high_school_football_2018.pdf
    • https://uploads.strikinglycdn.com/files/7fb98c57-5952-472b-90dc-5d0b14a26c04/pogobob.pdf
    • https://s3.amazonaws.com/zupenafud/xufuzodekezetulugoperixef.pdf
    • https://s3.amazonaws.com/susonanezaj/o_holy_night_trombone_shorty_sheet_music.pdf
    • https://s3.amazonaws.com/zamuriza/67882047038.pdf
    • https://s3.amazonaws.com/gofilafixu/the_big_4_agenda.pdf
    • https://s3.amazonaws.com/tipikaxe/61180813269.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8eb.bin
6430168417fb7d185c462685cb3d95c82a27f7acd872493d2a22e25374681f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EB 5800 bytes
font_01_sfnt_off0000bc8d.bin
94c10690e7603a7cbe280d07faf1ed890f1e6b69fd930f925a9e096314e61362
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 9840 bytes