Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6f8b4ed3d59933…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 23:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b71084732f9ab6a8c3d19a5934c7de SHA-1: ae4891f67a36fee7f0da83897046b809f80c89e3 SHA-256: ec6f8b4ed3d59933d091e475a8563c395fb78a89363a94d9dab6cec8f7f40441
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains references to calendar templates and the redirector URL. This indicates a likely attempt to lure users into clicking malicious links, potentially for phishing or malware delivery.

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=2020+monthly+calendar+template+word+with+holidays
    • https://static.usrfiles.com/ugd/0d002d_d5f1f6fde019413086350b06fe8fa9d2.pdf
    • https://static.usrfiles.com/ugd/15cd4d_f2fb16558bfa47b4bfb6370fa62cbedd.pdf
    • https://static.usrfiles.com/ugd/921909_27164da1d762413581bd18f36c0da95c.pdf
    • https://static.usrfiles.com/ugd/b916f4_8816706ef4474d11a0fc571ea8d9055e.pdf
    • https://static.usrfiles.com/ugd/3649d2_54992a8d44d84d8a82171824ea027482.pdf
    • https://static.usrfiles.com/ugd/fa6f14_675144d6258a40af8cffcc4589b51898.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6709bc75bdb48f1aad4cab8ec6c77ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cb249e18913408192493da6e1c30e36.pdf
    • https://static.usrfiles.com/ugd/ac72e0_819090d1cc4445e48dcc6ac04c744aff.pdf
    • https://static.usrfiles.com/ugd/906e9f_246143bd3a6a4a88849f72ac0c858cb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4331bf6850348ae97cdea7eee0664fe.pdf
    • https://static.usrfiles.com/ugd/2c8d66_8b6c3c53634d4432891a1f60281500ef.pdf
    • https://static.usrfiles.com/ugd/269bb8_46b6398210a94e24b0e0833003c9b5fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/bf0735_239bfc42521c466ea556faeb87263980.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_off0000641e.bin
c01b223475cdb42da64491e2f0dbe655073bbc917c28d78afca37f3e5ca3d8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 5688 bytes
font_01_sfnt_off00007761.bin
1cbe41b62b4c3cd2303d29714ce902520cba242ffaa3d44414cfa12632f4a29a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 14984 bytes

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