Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f71d64ea3c94b02…

MALICIOUS

PDF

41.6 KB Created: 2020-09-03 01:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b85abf543302d9b20ef28b915b91ca3 SHA-1: 9768a9bcbe0c719e0187920d860353bfd611b3d6 SHA-256: 7f71d64ea3c94b02693c0ed418b3bf1be98189533b9faa8ea864668968efe0b0
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to direct users to malicious sites. One critical heuristic identified a PDF link to a known malicious redirector, specifically 'https://ttraff.link/wix?keyword=about+synonym+formal'. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to external PDF files, suggesting a link farm or redirection strategy.

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.link/wix?keyword=about+synonym+formal
    • https://static.usrfiles.com/ugd/270e53_74ba5f982b3140239d6fe8ed075c0c4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b128c3a141f74a0eb75a7d75772ce05b.pdf
    • https://static.usrfiles.com/ugd/a44510_2caa5882b8f942828067ff07368e9e7a.pdf
    • https://static.usrfiles.com/ugd/217d68_99422a63e1514bf28b3c201d6efa25af.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8314/files/6860451291.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/99233775717.pdf
    • https://cdn.shopify.com/s/files/1/0449/2463/3243/files/multiplying_fractions_worksheets_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/84026268539.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/central_pneumatic_3_gallon_air_compressor_manual.pdf
    • https://static.usrfiles.com/ugd/538d67_6396bffaf04e4c8e914a0edecd93b734.pdf
    • https://static.usrfiles.com/ugd/bf650e_02ab610995104105a4e797071d2f276e.pdf
    • https://static.usrfiles.com/ugd/daca0d_c3b305764b1c406f97842e47a353f742.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ac3770fcc0410eac93eacff9e17f07.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/09c3c7_037f5e14d03340d6bf6600f630f7cd44.pdf
    • https://static.usrfiles.com/ugd/83b1b3_f54c26cd2a92432987503057a77f183a.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_off000061ff.bin
1291a23c0ed6b0b7b923f87a7afa7c7620e58065d3bfada77879ec9db210df2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FF 5144 bytes
font_01_sfnt_off00007370.bin
2715d21b69f03f7aa85773b2d3a68834d1b1467e02a7f8aab90182f975bced9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 11568 bytes

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