Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b617d27cf38f54…

MALICIOUS

PDF

72.7 KB Created: 2020-12-26 16:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98efe6b6e630ca902419ec5a5325d5ec SHA-1: e87b33e3d44da699d8f9ff926a08fa8b5126b6b3 SHA-256: a9b617d27cf38f543e807b512dd2988669daeb8bd68435274a1b8c5b739e7515
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a theme of 'personal safety alarm reviews'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious or spam content. No scripts were extracted, but the PDF structure itself is indicative of a link-farming or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=personal+safety+alarm+reviews
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5fca5c4b899e6.pdf
    • https://dugizade.weebly.com/uploads/1/3/4/4/134442098/jeduzoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wemupajese/guberotisemitoza.pdf
    • https://s3.amazonaws.com/jofunozuzof/morerevuki.pdf
    • https://s3.amazonaws.com/davolazupivowi/december_9_1974.pdf
    • https://s3.amazonaws.com/vufupu/70794550591.pdf
    • https://s3.amazonaws.com/tuzakifezara/16308347866.pdf
    • https://s3.amazonaws.com/rizijubovapuk/jusavotukedobugukan.pdf
    • https://s3.amazonaws.com/fukepez/tosarelije.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/affine_transformation_inverse_matrix.pdf
    • https://s3.amazonaws.com/ribowexulo/david_hart_actor_personal_life_and_family.pdf
    • https://s3.amazonaws.com/bisiku/defoxemawipupume.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_off0000e10d.bin
ca4e838233d0fde7c79ac8a1a9ad14e5664448679809ea3d7f91039f28dd47fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5168 bytes
font_01_sfnt_off0000f2a0.bin
b4a099a527a9e72c3a1bc255084e30e31a75143f9b1b2e243e0fc77c2c49ea4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10336 bytes

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