Malicious PDF — malware analysis report

Static analysis result for SHA-256 687de33241807f88…

MALICIOUS

PDF

71.7 KB Created: 2021-01-10 05:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b8d02c4b43278339433ea609128fcd0d SHA-1: c39087cb94ef72c1d725e2f506b2bff678e8845d SHA-256: 687de33241807f882129e3782e12819a98387c33a55f99582e372dad802123a2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one identified as a malicious redirector (https://cctraff.ru/123?utm_term=castle+card+game+online). The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable infrastructure, further suggesting malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=castle+card+game+online In PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/2993125.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/bisepiw-sewoka-lijamoxe.pdfIn PDF document text
    • https://site-1168251.mozfiles.com/files/1168251/93172312152.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/GkijjeW/crossing_swords_tattoo_meaning.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/monster_truck_driving_games_online.pdfIn PDF document text
    • https://site-1208723.mozfiles.com/files/1208723/kukibutipuvojofibotixum.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/b53892.pdfIn PDF document text
    • https://cdn.sqhk.co/zegodoxelob/JgjaZmd/never_gone_2016_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/Ja2ifii/rozixepufifasogof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/25_cognitive_biases_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/ragozesigosukuguberuvemaj.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/update_android_10_android_one.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5164 bytes
SHA-256: bcebe82b3b7b6e22e0ac845834fd76fe90a38d2882790a7b0dade82438520b51
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10408 bytes
SHA-256: 73b36813d9ecdfac46695b1e7b10d9660c04945e26bfb2efd3275257efa166b3

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