Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb87238c87342d6…

MALICIOUS

PDF

42.5 KB Created: 2020-09-02 02:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6d1a55ffebd3e174732d8de6cefdaa SHA-1: a589b81daeaf981826379d8b869996438b52f6bb SHA-256: 2cb87238c87342d650fb9d5dcfbb2eecd51ce0be0333f5be9f7aaae284daa6b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify and static.usrfiles.com domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the same suspicious URL and references to 'corrugated stainless steel sheet fixings', reinforcing the lure. No scripts were extracted, and the primary malicious activity appears to be redirection via embedded links.

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=corrugated+stainless+steel+sheet+fixings
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/kalero.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/nalezejizuxin.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/zobolupekasajazenixux.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/57660066230.pdf
    • https://static.usrfiles.com/ugd/97634b_8b2f47c43c84484f9eb17550fb9f187d.pdf
    • https://static.usrfiles.com/ugd/9f69bd_59ba0682fdb041bca0b33c08ef43e1b2.pdf
    • https://static.usrfiles.com/ugd/8ab72e_a9b40463cdf44cf0b661735806e978ec.pdf
    • https://static.usrfiles.com/ugd/9e53d4_6ff229e074734cc3b71336aac00f7567.pdf
    • https://static.usrfiles.com/ugd/e3c460_7d4493d498494abe9dc73fc3f8de6876.pdf
    • https://static.usrfiles.com/ugd/a467d2_fdfa208e90d442f8817533eeab7eb46e.pdf
    • https://static.usrfiles.com/ugd/2c608b_5e8ea3b2b15b4a27b5b1cc6a78031093.pdf
    • https://static.usrfiles.com/ugd/11baf9_59dd778e0e6b428a808290ae6e307cf8.pdf
    • https://static.usrfiles.com/ugd/98857b_1c0b916c48f443fd88b1c865eab38ecf.pdf
    • https://static.usrfiles.com/ugd/81d6a4_5cc845d4cf1d4371be9541f60da00619.pdf
    • https://static.usrfiles.com/ugd/0c268c_f1b0c58ffdcc4a7da4b8685fd8baafe2.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_off000068ba.bin
cebf5feb6a1f0702b8629bbe2e3df37bfd19113aaa49a21f2a41c9622c573b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BA 5144 bytes
font_01_sfnt_off00007a36.bin
90f6e526e6463143963a7b98a3a4ac77d57a8e5df42a5f2f6f2664e3c60c1278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A36 10144 bytes

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