Malicious PDF — malware analysis report

Static analysis result for SHA-256 c028aa2601ec2add…

MALICIOUS

PDF

35.7 KB Created: 2020-08-31 12:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae113552c586117176416abdde55b53f SHA-1: 1040876331d1ea8bb01a7a908b893e6dc95cf23f SHA-256: c028aa2601ec2addcb8a217349c879d08f5297b42ffee746e6ed52eaba617933
150 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=segundo+teorema+de+traslacion'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to static.usrfiles.com. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=segundo+teorema+de+traslacion
    • https://static.usrfiles.com/ugd/b8c837_8b05a0a6ff51488e9516e0d1cbbee83e.pdf
    • https://static.usrfiles.com/ugd/9cb927_5d8717e2b720441bad19976bfe28a350.pdf
    • https://static.usrfiles.com/ugd/b8c837_46f6a3b0ad8842e9a77841f0ba807c20.pdf
    • https://static.usrfiles.com/ugd/b8c837_5582239335634f1e99800c337b8d7263.pdf
    • https://static.usrfiles.com/ugd/b8c837_03186abb292c4270861edeec6251bea5.pdf
    • https://static.usrfiles.com/ugd/b65acf_42b738b6cffb4fdbbd255e3b9cc56c6c.pdf
    • https://static.usrfiles.com/ugd/9d869b_ee14e8cd41e64d97acfe2e0e2b810e47.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f2b8e7dab6147c78548b4e5b26f0096.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73295986d444f3382ac896738b636b8.pdf
    • https://static.usrfiles.com/ugd/e78b77_7b36b54d13644ab5aac1c9fafd4c488e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a83a1824b4b04dc091bd4d169c678eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a1767b0ebf4c67a7d7807bdf1b2781.pdf
    • https://static.usrfiles.com/ugd/93c935_196164837d004e06b1ccb3f579b32bba.pdf
    • https://static.usrfiles.com/ugd/d2751c_4002a3d0dad9492ea82e5aaae7c41fc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f7374e4ddc74456af9432fd1a30e279.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_off00004fca.bin
76f2a9ce7e4214390219bb0df35fdfd9927562a34df57b0fa09bf05841554cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCA 5364 bytes
font_01_sfnt_off000061e6.bin
54bd37170e68cbc16436af1b5188ef99e4d7d9f025c20b72da9a2fc81a9d87b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 9324 bytes

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