Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be43fba85936205…

MALICIOUS

PDF

49.1 KB Created: 2020-11-07 11:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b96f47eed2b7ee9273309e5e4d771fa2 SHA-1: 66a3557f50a904db868bca9acfcb55de1db7d251 SHA-256: 8be43fba85936205052901d40452f4629e73bddd9dfc2d95ee0b0bbead304486
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains links to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The embedded URLs, particularly the one pointing to 'traffmen.ru', are highly suspicious and likely serve as the primary mechanism for user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?keyword=zero+gravity+tournaments+basketball
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f936ea3c2c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fa60d15af831.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f887356edec9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75c30457-5fd8-462c-aefd-d4ec669691f0/bobebarudokopuvuga.pdf
    • https://uploads.strikinglycdn.com/files/906c683f-65ca-4200-b44b-0535f95bdbcd/68760190742.pdf
    • https://uploads.strikinglycdn.com/files/a302319b-6196-4796-83ab-ad504e8f7a91/soccer_heads_world_cup_unblocked_2018.pdf
    • https://pemamakavigu.files.wordpress.com/2020/11/how_to_use_bevel_protractor.pdf
    • https://uploads.strikinglycdn.com/files/70c0e7d6-6134-4d45-ab1c-0cebad1c90b2/wendy_s_allergy_menu.pdf
    • https://uploads.strikinglycdn.com/files/5af193cf-e28b-4267-aafc-cc5a03b964fb/69544440979.pdf
    • https://uploads.strikinglycdn.com/files/a22e225a-6fb4-407a-878a-e70d3b60a7fa/10210245191.pdf
    • https://uploads.strikinglycdn.com/files/c925c9cb-0815-452c-ba71-2888c43f68db/39520348848.pdf
    • https://uploads.strikinglycdn.com/files/2fbc79e9-994c-45c0-9e22-5cd4dbeea64d/wolilinaged.pdf
    • https://uploads.strikinglycdn.com/files/1931c199-21e3-4a8c-a689-0f16a21f0645/84731861912.pdf
    • https://uploads.strikinglycdn.com/files/78683809-5dec-49a5-844c-bb416d5d1850/64941745485.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_off00007f6e.bin
1c7b834f6389ccfc71af7b51f794be8d8e054ca3a03c4d968157b460339795ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6E 5328 bytes
font_01_sfnt_off0000918e.bin
44034953a54479e74591e6527a2d0951f0b1c0e403f3d5028391ceec55efa9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918E 11196 bytes

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