Malicious PDF — malware analysis report

Static analysis result for SHA-256 043db8b3dde8f7ed…

MALICIOUS

PDF

43.7 KB Created: 2020-11-08 05:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 055cb1dcdad237837e0fa6274562ca48 SHA-1: 5c96a7ead3c0cab1958444b0a13976689f1e0698 SHA-256: 043db8b3dde8f7edd662ca2784c33b3c698f07496c4631bd847378fb077877cc
96 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, including one to 'trafffe.ru', which is indicative of a link farm or redirection to malicious content. The document body, though partially garbled, contains a holiday greeting and references to the authoring application, suggesting a social engineering lure. The presence of numerous external PDF links, many pointing to benign content, is likely an attempt to disguise the malicious intent of the primary link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffe.ru/123?keyword=feliz+dia+de+reyes+magos
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5f9b02e70aba5.pdf
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/fomifovak.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5f9a5e0700928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zirapiro.files.wordpress.com/2020/11/callapp_contacts_premium_apk.pdf
    • https://s3.amazonaws.com/mizeteb/28739444633.pdf
    • https://galitedavaku.files.wordpress.com/2020/11/85517446275.pdf
    • https://s3.amazonaws.com/dutimajizowa/animal_crossing_new_leaf_clothes_guide.pdf
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdf
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdf
    • https://s3.amazonaws.com/zidenigad/autocad_2007_2d_tutorial_for_beginners.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_off00006ba3.bin
0dcd1d488e14143556648009880609c1c8ff155652ceaa7c39b3711155d73ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 5252 bytes
font_01_sfnt_off00007d7a.bin
0c8b29c7e436bbd8fc30c908a0d0b56e988ecc9630bc88f3798bd25a0ebe10f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7A 10992 bytes

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