Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cdb8ec356018e9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 21:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73bb20177f9f42de72120fc75010e326 SHA-1: a76623f96d5dc790c8acf168f35edcd3bb13495c SHA-256: f2cdb8ec356018e92ac891a8f6ba1f48d28a8fb14b6ce2367b288d09b20cdb7a
120 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.ru/wix?keyword=que+es+hetero'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with 'https://static.usrfiles.com/ugd/3e0cb9_89cae7b07a9f4aa185b12e7353e1424c.pdf' being the first identified. The document body, though heavily obfuscated, contains these URLs, suggesting the primary attack pattern is to lure users through these links. No scripts were extracted, and the family is undetermined.

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=que+es+hetero
    • https://static.usrfiles.com/ugd/3e0cb9_89cae7b07a9f4aa185b12e7353e1424c.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e32447e3b6441d917e48ab411609f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9acda9ffa934ff98a9452f81e46c4aa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/mcps_calendar_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/kunidiligoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/21657056128.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c22cce53d44ffab0fb13b1d5cecbab.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_fac09bff584f4c888777f4e0dabcb96e.pdf
    • https://static.usrfiles.com/ugd/2e79a6_cc614bb728e6416f918aa9241af4115f.pdf
    • https://static.usrfiles.com/ugd/a771bd_48576fe33c05417c90cd2c5b3c6a3000.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8649b4894614051aeb2fadee47746f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9f4a6ee314c4b06980cee929825461b.pdf
    • https://static.usrfiles.com/ugd/d5d855_a41882949afa49ff98aff518f8447649.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_off0000639f.bin
746b133834aaa0e5b2da8e275d2cddd686eaea24eba99a797252788534199908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 4592 bytes
font_01_sfnt_off00007339.bin
89da055c826afa39de24bb5e176a072e1772147df728153dc4e127d9680bd94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 12048 bytes

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