Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a6c45c090e24e…

MALICIOUS

PDF

37.9 KB Created: 2020-08-31 05:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69776a64daf2127891a62bc71c669d7 SHA-1: f5272000831a26044e6a60449db77ef59198d301 SHA-256: 3f8a6c45c090e24e2fb6246a5d4b28d5d9d0681bd9fa6c88e466d40275775406
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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://ttraff.cc/wix?keyword=feg+ap+7.65+magazine+for+sale
    • https://static.usrfiles.com/ugd/b8c837_8afe13fc864541279414b3f8f116622f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3753394d468747edb7bf78b6cae32144.pdf
    • https://static.usrfiles.com/ugd/b4a829_9aba1985e82c4cddaaf3f170005796f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_233d63fd43384f64a6583dfb153e8502.pdf
    • https://static.usrfiles.com/ugd/565485_bdcf3001646348bbba11e30a1cfcaae5.pdf
    • https://static.usrfiles.com/ugd/7f16bd_de4048a8ca8b4f5fb7ad02884558934b.pdf
    • https://static.usrfiles.com/ugd/c3f88d_33a7f495c347470195c433b2a17a197b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/9d66c7_787673fbd2fd40508d7c8cdd408c1da0.pdf
    • https://static.usrfiles.com/ugd/738632_91f85b9a518940e98a7d347224ca3cfa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000549e.bin
273537e0b679ca9ad9ad6c98f7d7ddeaaab884c69ced522c085ea0017015cc7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549E 5616 bytes
font_01_sfnt_off000067c5.bin
c7341ce2bfa62de48927211bd9b83ef35f52953ea1281870b70553d9f8c07aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 10412 bytes

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