Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fef539690a51c57…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 07:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c01d1cff4907e32b4dce9bf3ad540e SHA-1: df2c5f4239618512186bfad742a21b0f2db2813f SHA-256: 3fef539690a51c57513bd6bb2f6cd4c34e94f98d47a8a1761bd0a40edecef1eb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=pepsiman+controls+pc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on 'static.usrfiles.com'. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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.ru/wix?keyword=pepsiman+controls+pc
    • https://static.usrfiles.com/ugd/930050_a328b9fb85c7472e9447ddad11017f65.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1c665a6c0f4ef59084568526fe18b9.pdf
    • https://static.usrfiles.com/ugd/19103d_433b03ef5d4b4873afe96eca8cff81eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fb55a0add6e4304b3a96b56f0bdc8e2.pdf
    • https://static.usrfiles.com/ugd/b11f6d_bd5ed45262034c9fba649874c60f6cbb.pdf
    • https://static.usrfiles.com/ugd/6290de_dc386577f5ad424cbf97569769f8ce6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd17f8a3385d460f9024152796aec39e.pdf
    • https://static.usrfiles.com/ugd/b8c837_928d4ae96bb3437abc9af4af673dde39.pdf
    • https://static.usrfiles.com/ugd/b8c837_5766da1bc2e24f4c8de0af57edfe7873.pdf
    • https://cdn.shopify.com/s/files/1/0450/6419/2150/files/42656125768.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/whirlpool_duet_electronic_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/75203925543.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c241bf2bd904e6089d9dccdb7324562.pdf
    • https://static.usrfiles.com/ugd/b8c837_d25d82c8fd9f4ffeb8bf7ae5e9b12481.pdf
    • https://static.usrfiles.com/ugd/7f16bd_bb20389e8da34f179edbe317329a31bc.pdf
    • https://static.usrfiles.com/ugd/2274a7_f2b6bc5141034726bc698803d9e77dc7.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_off00006397.bin
43220e6b8a4cbe896187a25bcf27c298843c5ec088d62549507e4f430366adf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6397 5080 bytes
font_01_sfnt_off000074b4.bin
46c1cb80bc5949ff52591e89ee5fad4a11d60f584565d5f9fcc5e6448a4eecda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B4 10016 bytes

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