Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a607050dff1ad4b…

MALICIOUS

PDF

48.8 KB Created: 2020-08-31 05:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5758ec6b7f17fd590d520648dafa6029 SHA-1: fa1b1afc7507738e0b02a8e304d890fa7363ac70 SHA-256: 3a607050dff1ad4b7284ef1e648a40037f4429d98c73cd5f34b8b54bc64d4ab0
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=etimologia+de+antropologia', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to 'static.usrfiles.com', suggesting a coordinated effort to direct users to malicious infrastructure. The presence of multiple links and the malicious redirector strongly indicate a phishing or SEO poisoning attack.

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=etimologia+de+antropologia
    • https://static.usr
    • https://static.usrfiles.com/ugd/c345b0_b66a2d047065416e89e76ba2b1630f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_842076b0f3044061a91b717af4f3cd86.pdf
    • https://static.usrfiles.com/ugd/0c268c_53439667742c46e09b9349d1d4649567.pdf
    • https://static.usrfiles.com/ugd/1f2646_9cf01d739e5445d3a66b43d18d7ab3a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a73af7e2b0f4ecca4c2399887728be6.pdf
    • https://static.usrfiles.com/ugd/4ae4db_a6f5618cfc5c4889ad11eeb370766c63.pdf
    • https://static.usrfiles.com/ugd/de60da_bda237cb7af647158c7d99fdbd2236af.pdf
    • https://static.usrfiles.com/ugd/2f7815_bff2926dbcff41e595494001b029c24d.pdf
    • https://static.usrfiles.com/ugd/b3bc21_e0b201b9f71e4e46b39488efe63be2f2.pdf
    • https://static.usrfiles.com/ugd/3b47cb_7a4a8894a9a34932aa5abf0ac0e7defe.pdf
    • https://static.usrfiles.com/ugd/238140_ded123685f124beab5bfd257f5a4cb3d.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_off000065a6.bin
6b5243eb1ee849daa5f95cda6de16cf36651741ea03b27562934728108dc9bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 5056 bytes
font_01_sfnt_off000076ba.bin
873d486ed9b9d50df6be3621284998310780ee04bdf42525365d727dda77b371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BA 12628 bytes
font_02_sfnt_off00009f1e.bin
7507748dd3b0b61c8445662e79b0894f17c83e73bae53e4cd727c6858953722b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1E 16200 bytes

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