Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98e9057674b5565…

MALICIOUS

PDF

31.8 KB Created: 2020-09-13 06:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9a31aafed285f0262bee0db1a21258 SHA-1: 0e0fafd84488cef19556c2359120b759cd41ad17 SHA-256: b98e9057674b5565f2fe8b516ac2b899b74d165056e866c5b6625651194ad486
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, specifically pointing to 'https://ttraff.link/wix?keyword=looney+tunes+ringtone+m4r'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a lure to external malicious content.

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.link/wix?keyword=looney+tunes+ringtone+m4r
    • http://files.4sidedstove.com/uploads/1/3/0/7/130775027/palux.pdf
    • http://files.horseplayfarms.net/uploads/1/3/2/3/132303378/6566907.pdf
    • http://files.happycapehostel.com/uploads/1/3/1/4/131437859/8887112.pdf
    • https://static.usrfiles.com/ugd/b8c837_68deb2993345474ea8b91d98a72facf5.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_73eb0f9a6379427e90a951d9173e7084.pdf
    • https://static.usrfiles.com/ugd/e32576_ce11ad0427204b39b8eddc4e2e4bd86d.pdf
    • https://static.usrfiles.com/ugd/011e4b_77cc5f385f0944b3ad7e8ceebbad0ff7.pdf
    • https://cdn.shopify.com/s/files/1/0458/0963/1398/files/jopegoseves.pdf
    • https://static.usrfiles.com/ugd/9e53d4_ccc7d575335d41b5af8e2a752d28c32c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b8642a04daf4aa4abef7eb2c041b8a9.pdf
    • https://static.usrfiles.com/ugd/9cb927_8f0c8bfc5c644a7caa5b12cd28e4f01d.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_off00004116.bin
b80a9e31fb49f7dac7ee91f055d750d4dcb4c67b4028573f849f9cbb417bb2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4116 4896 bytes
font_01_sfnt_off000051bb.bin
8fc81014ed3ffb4c1f47565b5880876168d22f649a8d647b9ab1a0a6651a4bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BB 9684 bytes

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