Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08551d3575dd121…

MALICIOUS

PDF

36.7 KB Created: 2020-08-29 23:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6116e6be8c76f3987a9852fb421345b SHA-1: e387ea7858f7c0da141ca85f4f5b95f83c17bb60 SHA-256: b08551d3575dd12197bc29cb9db3cdb497e359ed1d91950c45b604a05748676e
150 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, https://ttraff.ru/wix?keyword=killer+joe+benny+golson+sheet+music, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to sheet music and the authoring application, suggesting a lure. The presence of numerous external PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy, likely to obscure the malicious redirector or to improve search engine ranking for malicious content. 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=killer+joe+benny+golson+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_359302ef7ad94a2c92cf42d94a96c43f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bf73c9469a149e29844297101e16ec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b6bc9abede144451ad49a9063d2fa262.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8426/files/dutalibimexebowubunafajun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/besozuzowatamaxed.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_7bca125202a746989840e385b1487833.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_eae66dfb809b4e0197fe6905f08c1e9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0403c9899c94e1bad4fb3eb99ce3fe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b54a9d3abc9d49a990bfec7a8d823e08.pdf
    • https://static.usrfiles.com/ugd/8b2c09_571c197366c44c458f303fca90adbdcd.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_off00004f91.bin
81b8b502e630d57e46f32cb0ca84313e482c80c1a47d2bd7b277675760d93a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F91 5292 bytes
font_01_sfnt_off00006175.bin
9a314200777b43f50967b7f675793690d591d6330e1c45b5eb7f63c1bd5a565b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6175 10728 bytes

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