Malicious PDF — malware analysis report

Static analysis result for SHA-256 238ef8633a0804e9…

MALICIOUS

PDF

44.6 KB Created: 2020-11-06 07:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb2d43b4264e6c800535e92cdc08d45 SHA-1: d39876387c27ccb1a6c536c98b9a6fee00cb6e97 SHA-256: 238ef8633a0804e95626190504798799c2f5d2846f8972ddefa775e1b07e0da8
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary URLs extracted is 'https://trafffe.ru/123?keyword=happy+wheels+free', which appears to be a lure. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to drive traffic to potentially harmful sites or host malicious 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=happy+wheels+free
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f87d28c0c882.pdf
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5f90344468e7a.pdf
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f9aad936c24e.pdf
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f9775389081b.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f961fa02b366.pdf
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fa3d6aee9543.pdf
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5f9ce1a9745df.pdf
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5f95aba26cfca.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8986ccb9798.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/balancing_a_budget_worksheet_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0500/7373/1235/files/subway_surfers_world_tour_mumbai_hack_apk.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_off000070d3.bin
48685563ff8e7d8b6cf5706828cdbc38ca70790abfe9b15cfd2bd5b3e700cc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D3 5144 bytes
font_01_sfnt_off00008266.bin
9e04e0b4e550a4e171a6a885c9f0ec0c186e05ef66a3aa23ef72ef0e779d10fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8266 10500 bytes

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