Malicious PDF — malware analysis report

Static analysis result for SHA-256 4246dfa6ad0d5513…

MALICIOUS

PDF

39.8 KB Created: 2020-11-06 10:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8d163956a0da1758c91fa74ac4307d8d SHA-1: 7ba9c1d64e9e1f1837d009641d971283b94a3d6b SHA-256: 4246dfa6ad0d5513d6e9bc597593d0e8e2f083b5fb0ae3ace518152e11ec4ce3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary URL, 'https://trafftec.ru/strik?keyword=ordinal+numbers+worksheet+2nd+grade', suggests a potential SEO spam or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/strik?keyword=ordinal+numbers+worksheet+2nd+grade PDF link annotation
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/e7dca301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f8ce3e91ec65.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/5576367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fa3bc384f4da.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/bea5fe0c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_5f98c98a7e679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5f9e954d86ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f9770dbaff2d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/7605231.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/pavibaripoze_wodogubi.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_off00005c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C14 5696 bytes
SHA-256: 460db093ba6fc6648902a12c0fe07f70f5910454277ec2aa86ca4ca2b06d8f8e
font_01_sfnt_off00006f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F57 10364 bytes
SHA-256: 9e6d488915f9735185831ff20141a95f3a1a25a363b59e3f0e42c685d8a8a758

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