Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ed919e27db884…

MALICIOUS

PDF

124.2 KB Created: 2020-11-07 23:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64528d8e9fb798e6fcf92a9c4642244 SHA-1: 13e2b049681fb995881a8289fc00255e10db530c SHA-256: 991ed919e27db8844190a5764ccbd9c7553a73af50ab7b23da4fe4119a20fdcb
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary focus on directing users to 'trafffe.ru'. This URL is presented in the context of a science textbook, suggesting a deceptive lure. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports the conclusion that this document is designed to redirect users to potentially harmful content.

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=cpo+science+physical+science+textbook
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/6ea6ef826f56.pdf
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f96e8266a232.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f9be94b775c1.pdf
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/3cd1fe0000612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gowatomu.files.wordpress.com/2020/11/sindh_anti_corruption_act_1991.pdf
    • https://vifuvux.files.wordpress.com/2020/11/worldview_critical_editions.pdf
    • https://uploads.strikinglycdn.com/files/bf762e53-8f44-49e2-b0fd-e3ebddfa5c7f/vojarepafulu.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/17039254495.pdf
    • https://tojegilebi.files.wordpress.com/2020/11/1067828227.pdf
    • https://s3.amazonaws.com/texifaxepag/busukolojepodadogulagej.pdf
    • https://s3.amazonaws.com/pisik/rozirex.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_off0001abbe.bin
2f4cd32b3506b0ae72ce633a50b837468c255eef914dd70c0598f396d2e05fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABBE 5204 bytes
font_01_sfnt_off0001bd76.bin
91e3d19d4256ae10d8e5c6a3780ea794ab7c2445fc5727718551f6a76513dbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD76 11832 bytes

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