Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff31ff3fccae6a54…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 23:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89943edfca846f015f9f2b93fcb8e909 SHA-1: f58d9dd5eff5c17efcd0df949d0045d3d58b167b SHA-256: ff31ff3fccae6a54d489755890748b56771ab6792118160d0306e12c475d5800
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was identified as malicious due to its inclusion of a link farm. The primary malicious URL, 'https://ttraff.cc/wix?keyword=treatment+of+idiopathic+thrombocytopenic+purpura+guidelines', is a known redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a coordinated effort to distribute malicious content or conduct phishing attacks. The heuristic firings confirm the presence of a malicious redirector and 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.cc/wix?keyword=treatment+of+idiopathic+thrombocytopenic+purpura+guidelines
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/21174279548.pdf
    • https://cdn.shopify.com/s/files/1/0432/6765/3795/files/how_much_does_crunchyroll_cost_uk.pdf
    • https://cdn.shopify.com/s/files/1/0436/1083/3058/files/89587955337.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f5f02556bc54717b8328048df782305.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3e26e588d44a439b6545c18e965d58.pdf
    • https://static.usrfiles.com/ugd/0a0016_bed020fae787474a8445ccb2c7ad7d47.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad64b139ef814e4697fa16b5cca6eaac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2fe5c954c0403892702dc696a2b420.pdf
    • https://static.usrfiles.com/ugd/b8c837_75d174eab1064ba5aaa37a2a460d1a06.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/tilikodevezubaxogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1336/files/school_uniform_suppliers_dublin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/8841709436.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_off000082a3.bin
5c244eac81659ac9f7506dc2336034d4fb3d8f41599790f32c567e142dcb2df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A3 5644 bytes
font_01_sfnt_off000095a4.bin
a7629b5311060b6eb60b793c7e58ddf08818d39778c72e20ca62ae13d117fa3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A4 10224 bytes
font_02_sfnt_off0000b8a3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 4324 bytes

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