Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2eac12e0fa6eaf…

MALICIOUS

PDF

44.0 KB Created: 2020-11-02 14:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c04336a18fc37bc42d8f88c1cef9aca SHA-1: 18ba0a2ab31692e6dc999b1b2ffd1125c251a00d SHA-256: bd2eac12e0fa6eaf0e12d39b1ed02e22dad5a17ef3889737f73fd783f2fea3d8
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a repair manual, suggesting a social engineering tactic. The presence of numerous external PDF links, some pointing to S3 buckets, indicates a potential link farm or content distribution network used to host further malicious content.

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 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.
  • 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://ttraff.ru/123?keyword=314-610e000+mtd+yard+machines+repair+manual
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/dofuwikajabuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divexikav/fisevumejoxola.pdf
    • https://uploads.strikinglycdn.com/files/93b2078f-a203-4c55-8ec1-d773b0b9be38/60683770189.pdf
    • https://s3.amazonaws.com/xezujuxoz/nekakuliwidakijin.pdf
    • https://s3.amazonaws.com/susopuzupure/anglican_church_of_southern_africa_lectionary_2018.pdf
    • https://s3.amazonaws.com/kavitokolezub/43405521115.pdf
    • https://uploads.strikinglycdn.com/files/0c202590-87cc-42fe-9d7a-47b3b3c98486/64324481661.pdf
    • https://s3.amazonaws.com/panalipolifod/13739556156.pdf
    • https://s3.amazonaws.com/foneniz/16194325463.pdf
    • https://s3.amazonaws.com/pazovugal/uber_in_rome_illegal.pdf
    • https://s3.amazonaws.com/mitakajazum/fatozavoronel.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_off00006c19.bin
4e9a83ae150f2df72ce019c0d0c2fc8dc947b58db57e6d79d92819b2e6ed7098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C19 5952 bytes
font_01_sfnt_off00008047.bin
44bc030d3f0c8f6ce7d2f31fedf8e2908ef91e2236d4b85f237cbe91ae635457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 10300 bytes

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