Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2085a092df210fb…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 17:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af64ac538ced07367ed992a88266acd8 SHA-1: 7feba3ed6978125b771a6957ab134b1c2e4a504d SHA-256: b2085a092df210fbc7168e102f1192278369b72462845f79308ba5b2c9e121d5
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=cdf+of+uniform+distribution+discrete'. This indicates an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm or a method to obscure the ultimate malicious destination.

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=cdf+of+uniform+distribution+discrete
    • https://static.usrfiles.com/ugd/e73fea_b21e3b589bf842d29f515b1fda5d4d20.pdf
    • https://static.usrfiles.com/ugd/dd4472_0d1bde1e4deb4c8380bd258a77f27098.pdf
    • https://static.usrfiles.com/ugd/2ca09c_1f514af6c46045e38fb19e2daba211ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c3b8b89cff342aabce7eeee745cf9f7.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/kovaguzamaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/human_resources_job_cover_letter_template.pdf
    • https://static.usrfiles.com/ugd/e6092c_25ac783c0ebd4432a33b216a4113aa55.pdf
    • https://static.usrfiles.com/ugd/4bb894_c010c527da8841299dca3236861b6df8.pdf
    • https://static.usrfiles.com/ugd/44b221_9ede7639cce744a581b6d57d1e1f2298.pdf
    • https://static.usrfiles.com/ugd/b8c837_e03fbc2826624aef8dd0d6211dca4743.pdf
    • https://static.usrfiles.com/ugd/0a593f_3c433405f6ec4c96b6781ba30866ab0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_84be0dd07e9441c8ba4c6d17d03b8329.pdf
    • https://static.usrfiles.com/ugd/7a11b0_7357fabae3e24628b21b971d32431e12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d4.bin
f75e28ae436005e2c3a87b572e89182f2824ff17f68b05ea56f5fe47702702fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D4 4972 bytes
font_01_sfnt_off000072a5.bin
a2063961b629a58c5802ef42895ced146c45794caac89c34e08a809597d21e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 14972 bytes
font_02_sfnt_off0000a1af.bin
0da5e5e86814effb3bd7b0e06fad45d2b725727bf35953bf47b280cb49cb232e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AF 17988 bytes

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