Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a532520fc1a7df…

MALICIOUS

PDF

35.9 KB Created: 2020-11-08 10:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3f8cdbaa5f13bf9510181f92c902ab4a SHA-1: 43fc06d3b381facf5b83e7079ed5a6fbcef8c01c SHA-256: 61a532520fc1a7df114b63ffd109c76479bc10953721947ca393f89664254d90
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the embedded links, 'https://trafftec.ru/123?keyword=our+generation+horse+stable+set', is flagged as suspicious. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be SEO manipulation or distributing links to other potentially malicious content, rather than a direct user-facing 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/123?keyword=our+generation+horse+stable+set PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f871bcf7b541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f89351802377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5f9a0a91d7007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f9b75dcb1965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_5f963a624b2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5f96196e5fd3e.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/zikeko/12_3_rna_and_protein_synthesis_answers.pdfIn PDF document text
    • https://sufaravoxes.files.wordpress.com/2020/11/visuvixubaled.pdfIn PDF document text
    • https://fujixowezizu.files.wordpress.com/2020/11/xamurevasomevasadedot.pdfIn PDF document text
    • https://pavezisetapo.files.wordpress.com/2020/11/namejifefofiwikok.pdfIn PDF document text
    • https://fexadosiwif.files.wordpress.com/2020/11/the_lark_jean_anouilh.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/necesidades_bienes_y_servicios_economia.pdfIn PDF document text
    • https://bijusonif.files.wordpress.com/2020/11/entre_les_murs_franois_bgaudeau.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.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_off00004cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD1 5112 bytes
SHA-256: 27faed2b17a6705344fbfc8b18dec31178b5b2e562d116fab732bb42d284ce32
font_01_sfnt_off00005e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 11040 bytes
SHA-256: 5af4b7f5b3c54b011d7f2e05f58d5a67159bc83196e2e0d85280deae0e40861f

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