Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfedc635dbac15a0…

MALICIOUS

PDF

63.1 KB Created: 2020-08-31 03:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a86200ffc109b1fbb23a0806001119e SHA-1: 16116cc27394d9085bfd47bacee061a3509ac209 SHA-256: cfedc635dbac15a04866e3d7f23d8e8cdf3e31640222d10c9630d47fac4a590c
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=cadences+examples+pdf', suggesting a lure related to 'cadences examples'. The file also contains a large number of links to 'static.usrfiles.com', which is flagged as a link farm.

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=cadences+examples+pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://static.usrfiles.com/ugd/2f8cea_434c738102d747e78f556cc7b41e6511.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea71c40b953e43ccac0318b398318834.pdf
    • https://static.usrfiles.com/ugd/105a8c_17096100a6e24259be7476b8bfccca7a.pdf
    • https://static.usrfiles.com/ugd/cc03df_9cd1356752ee4216bd5e873c1fbfbd26.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2f34cd483544153a5171f0f43347676.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ee5617878fd4a9a9e61d66508453e7a.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_39cd65f788e04f56a227a816e842323c.pdf
    • https://static.usrfiles.com/ugd/67e251_95927aa10a3d40e881100c957ce82845.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_c44f3fd8d7484c5a90e2b946249492ac.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/emulsion_polymerization_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/network_screenplay_paddy_chayefsky.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/76562372860.pdf
    • https://cdn.shopify.com/s/files/1/0447/8317/3798/files/free_tor_browser_for_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/cd_zezo_as_melhores.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_off0000a424.bin
53b908620819dfcd0a90f1a05791f52f837dc15ff16d11a1a2d345b715b4aa9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA424 5180 bytes
font_01_sfnt_off0000b5b8.bin
1e6595bfb95f2e8837ca87c4eb0c54a49b4ead7f8ed8271e70134d016e6c0404
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 10568 bytes
font_02_sfnt_off0000da09.bin
dcf5bf9068761a66a65f40ee5aed8df972f266ddb8aeda1fcf15af54b1a3ac9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16200 bytes