Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9d156462324b9f…

MALICIOUS

PDF

40.4 KB Created: 2020-11-06 04:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e64deade50b51cbee36c6553173c5e0e SHA-1: dd070175131ae05325442092a4ebceb1993a702b SHA-256: 3a9d156462324b9ff283e4cc9182fb5efb9c3797290bf454707e6a7f3ae6896c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results or direct users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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://gettraff.ru/strik?keyword=dead+elm+tree+pictures In PDF document text
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/mivaxegudoxesiduwowa.pdfIn PDF document text
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/radogenufa.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/70eba58ebba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f86f854c5ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f913c2054314.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/b9a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f9143209fd0e.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/vozagozuwodesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f892b941b27f.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/pubasilowitojefeja.pdfIn PDF document text
    • https://musiwimo.weebly.com/uploads/1/3/4/3/134359140/ac406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/daae0780-3b0f-44c8-a3ae-bcbccc86c3c9/32569515842.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 5220 bytes
SHA-256: 77db4c0e4c8afcd4aa1909c9cae984de2cd7227a44e4d9d097a981c23af77d93
font_01_sfnt_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 11328 bytes
SHA-256: 8466ec156a341444eac8cc67cf134a901eaa44a75d4731e50f327f2d10b0302b

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