Malicious PDF — malware analysis report

Static analysis result for SHA-256 7105cd2d4e26d011…

MALICIOUS

PDF

55.2 KB Created: 2020-10-15 17:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43cbbb1f077d7b39e6f47a71b4585fb3 SHA-1: 848fd55a50dc671618ec6152c4ef6ef381c9f5c5 SHA-256: 7105cd2d4e26d0118340af328fc3be92b6f1ccd4cb9f5f5ce2d654b69cafe95b
124 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URL `https://cctraff.ru/strik?keyword=apush+chapter+23+pdf` is a primary indicator of malicious intent. The document body, though heavily obfuscated, contains this URL, suggesting it is the intended lure. The presence of numerous other links to disposable hosting further supports a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/strik?keyword=apush+chapter+23+pdf In PDF document text
    • https://site-1042279.mozfiles.com/files/1042279/zekefifofavudobozupo.pdfIn PDF document text
    • https://site-1043760.mozfiles.com/files/1043760/66314891837.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/kubelusuzowuxokojirin.pdfIn PDF document text
    • https://site-1043667.mozfiles.com/files/1043667/sedepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f877d2208676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8707fe83c5f.pdfIn PDF document text
    • https://site-1041079.mozfiles.com/files/1041079/95742698805.pdfIn PDF document text
    • https://site-1040165.mozfiles.com/files/1040165/13939633575.pdfIn PDF document text
    • https://site-1042602.mozfiles.com/files/1042602/4333794003.pdfIn PDF document text
    • https://site-1040600.mozfiles.com/files/1040600/45621846656.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/zemujebufekasakikuz.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/gokagatalovevilej.pdfIn PDF document text
    • https://site-1039711.mozfiles.com/files/1039711/dimugakokivowas.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/9500027.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/vulawupomonam-nuruzo-popuxupor.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/97e16.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.pdfIn PDF document text
    • https://site-1039564.mozfiles.com/files/1039564/palenefarekumopatunaxen.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/20360860433.pdfIn PDF document text
    • https://site-1039638.mozfiles.com/files/1039638/71551014156.pdfIn PDF document text
    • https://site-1038913.mozfiles.com/files/1038913/16170425733.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_off000098f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F8 5496 bytes
SHA-256: 81ffec642050f91736f134ad434b6692a48bca539144e3eab677f85ce9e4d2d5
font_01_sfnt_off0000aba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA1 10756 bytes
SHA-256: 1e9e3a4cbc41536a60adfa0a8bf9ced92107cba499b63c6d4eb1d274124283ec

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