Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57447f388589090…

MALICIOUS

PDF

62.8 KB Created: 2020-11-20 13:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292057ffe76c87566be4fd115746ff9a SHA-1: 14cc5d23c91c2bff50be1039b8edc6aaae64f8cf SHA-256: c57447f388589090f07c4646fcb58c6bc6d1832db06f68b43e6229989dcca698
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with the primary suspicious URL being traffking.ru. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure suggests an attempt to redirect users to external content, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffking.ru/123?utm_term=harley+davidson+rocker+lockers
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8a19132acca.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/zuxizakabe.pdf
    • https://cdn-cms.f-static.net/uploads/4463010/normal_5fa811dc9b620.pdf
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f8a309e21670.pdf
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/59bb1.pdf
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5fb29535b6771.pdf
    • https://cdn-cms.f-static.net/uploads/4473062/normal_5fa54463569ec.pdf
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fb4aa10a6923.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f87cebe3-d28f-49d0-b5cc-5bf7caafe1f6/joel_watson_strategy_solutions_manua.pdf
    • https://uploads.strikinglycdn.com/files/61521846-2a43-48bf-b7f2-c773cce98044/7416335103.pdf
    • https://s3.amazonaws.com/zetare/list_of_antipsychotic_medications.pdf
    • https://uploads.strikinglycdn.com/files/f153d4f4-6e79-4e2e-9e9d-f149c10bebd4/84045444126.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7bb.bin
ed4f0e0e1fbb1cef2c344296da798daf1d68c10399e26417b7b2f3ed8431f70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 5120 bytes
font_01_sfnt_off0000c940.bin
5838363a44a672e4e47c8f35d4b2f76590bdb46475b8356ffc20710d04ef44d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 10524 bytes

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