Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7bbd166c14678…

MALICIOUS

PDF

46.2 KB Created: 2020-11-08 14:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b588a76568018c4ab0e9c0337f54ed57 SHA-1: d7a6936c19a5c935284fb611388fc35ce8cf90f6 SHA-256: 19e7bbd166c14678f4626322272886b01fa81e34135e2cf472b2091200f4d8b2
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary external URI points to 'trafffe.ru', which is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and the heuristic firings indicate malicious intent 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=leader+of+anti+federalists
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5f9f57d11f775.pdf
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8d58677f0f0.pdf
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f9d1540a6193.pdf
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f990ed5b1489.pdf
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f8eda8cd0070.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fa050d653133.pdf
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5f9de7b1b0627.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdf
    • https://s3.amazonaws.com/sivanira/mikaft_games_cepr_1.pdf
    • https://uploads.strikinglycdn.com/files/f990af85-5d9d-4231-9f6d-c6b3f9dfd0d6/kabe_imamlarC4B1ndan_fetih_suresi_dinle.pdf
    • https://s3.amazonaws.com/bokelur/29747719829.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_off0000765e.bin
89abc965cb435a3e809c2e80fce34a8c1610189e4dc416b87c366f8f190d0780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765E 4844 bytes
font_01_sfnt_off000086e5.bin
7baa9742938a6f55ca32517f2e3af9c0c067c676bf75c5b09d97816cc8fe2157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E5 10876 bytes

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