Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfea357237a2c11c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 17:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446f21f02d5187c601d9979a8f2d0b72 SHA-1: 99c999904332bfbcfc47421834799100df460e7f SHA-256: cfea357237a2c11c20523bb49d5e1579fe2aa3cf6c1ec936ead3988ec5e68432
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=adjektivdeklination+nach+dem+bestimm'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf' being one of the first identified. The document body, though heavily obfuscated, contains the same malicious URL and a reference to a PDF link farm, reinforcing the lure-based attack pattern.

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.com/wix?keyword=adjektivdeklination+nach+dem+bestimm
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e237eed91f44bcb7c667d4831e93a6.pdf
    • https://static.usrfiles.com/ugd/1f6d71_764236f45de54811a9b84f6633c71c3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dd76032c2fb4879846c6c50cf3f39df.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_95c89b9623774879b6a9c27948f86cbb.pdf
    • https://static.usrfiles.com/ugd/837d34_e64af69607544abf8187229671d1a7dc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/tubomizazix.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/aoristo_griego.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0464/files/66880875844.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/gozilaporubix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/quantitative_aptitude_questions_and_answers_with_explanation_in_tamil.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2392707558e499596ef8bb8350b9943.pdf
    • https://static.usrfiles.com/ugd/822ecd_9ade3470b355420ea64499bf40d629aa.pdf
    • https://static.usrfiles.com/ugd/493135_3b4c3df5a6c34b949f090e8263c5ba8e.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_off00005e5a.bin
14c60d9634ab7234c1903882dacd5eae4ee44f7151af44a3e7995adf2fb9907c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5412 bytes
font_01_sfnt_off000070a3.bin
6b9f8d413ddc17fbda0a209f57c0bd50529a3d7fe99699f8f33a021e8fd2d93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 11088 bytes

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