Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c150f16ac5bbcbb…

MALICIOUS

PDF

44.4 KB Created: 2020-11-06 02:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49547de3560cb3a207c926ced6007bb1 SHA-1: 97c292b767a9a4e18ddf2433e3ba7205ceca9201 SHA-256: 0c150f16ac5bbcbbd40ba126f2d809bf22d08ad72d6dc33296f1ddbb53be809c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with a primary malicious URL pointing to 'trafffe.ru'. This suggests an attempt to manipulate search engine results or direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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/strik?keyword=richard+gerhauser+youtube
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fa2c5a18ddd6.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/e7f342ada31746.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f92e1aa672a9.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5f9afe95a73b2.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5f9f6ecd82018.pdf
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5fa3e064e0b7d.pdf
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/7586157.pdf
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f95354548c8a.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f88693b34299.pdf
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fa3ee50d4012.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f9d184c4786f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0501/9844/6231/files/monthly_budget_sheets.pdf
    • https://uploads.strikinglycdn.com/files/f9590e9d-1d3b-445c-bf94-3de1915275ec/kirepivimafagetupubo.pdf
    • https://uploads.strikinglycdn.com/files/a3b39725-4956-4583-adae-f97ef5ef211a/76050954611.pdf
    • https://cdn.shopify.com/s/files/1/0497/4336/4257/files/ccna_chapter_10_exam_answers.pdf
    • https://uploads.strikinglycdn.com/files/e4f2f433-c92d-45bf-a9f0-8477aed03d54/ronak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb3.bin
435fbb86de72a2b6689b0e0c62e65b2e020b73ebb26f10a98ff4a85d5bc93b44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 5192 bytes
font_01_sfnt_off00007173.bin
8ee8a5e4e8ad941cc08a7a18df386e3426bf34234d07d8e382bfb6e4156b23e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 10896 bytes
font_02_sfnt_off00009697.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9697 4324 bytes