Malicious PDF — malware analysis report

Static analysis result for SHA-256 882ef1040468a0bc…

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 04:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d8864dd292af9db241d663f1ab1ef29 SHA-1: 0bbd3f797838cdbee41e9ca9b06e2bc245528a75 SHA-256: 882ef1040468a0bc4620fcf4b4935a342cacba924d75ac2b9102a688056c45a2
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=mi+primer+beso+libro, which is likely used to funnel users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com, suggesting a coordinated effort to distribute malicious content through a link farm. The ML classifier also strongly indicated maliciousness.

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=mi+primer+beso+libro
    • https://static.usrfiles.com/ugd/b8c837_b5b28534d826456db19f75b76b90f09a.pdf
    • https://static.usrfiles.com/ugd/b8c837_acdce137a6184e7483d279e9b1650b8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_98fd96e897cd4cdc8a5b05b1f5ad7974.pdf
    • https://static.usrfiles.com/ugd/b8c837_76acf84a5f9644468da6a8075c05713f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c39080e78f604e91ad39f0e2cb8067e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b910b96377f469aa9d4731c7fa21e48.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb82a22829c948088fe3de00d5cd58b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdc939491d92479f8f9e78a9789a4662.pdf
    • https://static.usrfiles.com/ugd/b8c837_111be8e04a0643abb911abb56fa8c3e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_344417b15c694c8ab78c02c761c291cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a60fd1361b84521a6891fcd4932acbd.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_off00004d58.bin
57dd8c2374360807b01bd89038df6280d352ec8ef5299ac07e41168686822aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D58 4900 bytes
font_01_sfnt_off00005ded.bin
11275be68c372958db0f020a5c3bee3bedb03267df8743b71f96102d110a6a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DED 11516 bytes

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