Malicious PDF — malware analysis report

Static analysis result for SHA-256 3283f0875c157e11…

MALICIOUS

PDF

49.8 KB Created: 2020-08-30 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fdbbd22e50db34386270f26d7212f28 SHA-1: ab6cb16c5abd8d5d1c7f996217f4ced8c93ff0f8 SHA-256: 3283f0875c157e11dac2b54ec2c47be8d7899ba0f651674d54afc2d9cad2399a
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm with numerous external PDF links, many pointing to potentially malicious redirectors. One critical heuristic flagged a direct link to a known malicious redirector infrastructure at 'ttraff.club'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=mathematical+models+in+biology+pdf', suggesting a lure related to academic content to entice clicks. No scripts were extracted, but the primary attack pattern involves redirecting users to malicious sites.

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.club/wix?keyword=mathematical+models+in+biology+pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9074/files/sejobokukozifefofavatesum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/essential_qualities_of_the_professional_lawyer.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/66743282592.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/toefl_reading_passage.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa723a4c6d640ff89f622fc68284b4b.pdf
    • https://static.usrfiles.com/ugd/784815_3e69dc0ce4e0492a8fb6269e0833609f.pdf
    • https://static.usrfiles.com/ugd/97634b_ba4539a8f6194c71b47c66605fc91eae.pdf
    • https://static.usrfiles.com/ugd/b8c837_f638475c55ef479c915449acb3f40f13.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/nasiralakeniwugafofuxul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/linkedin_profile_photo_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/20068876242.pdf
    • https://static.usrfiles.com/ugd/253000_93e0ef9841b9437bb87c937e66cfb88d.pdf
    • https://static.usrfiles.com/ugd/74c34a_978a8bd5268e4a35a9591ef49f71e92b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3980ecb40432683dddd56453d5a04.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/
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000810c.bin
9a2ebdb0549ddd9afa62449314437abc2d660df3470317911dc464d13942909e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810C 5720 bytes
font_01_sfnt_off00009475.bin
ab3bcbbd11604c24f6419a36ca8eac1d3cbd9c9c3d9a6270d4fdc5289e1885fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9475 10600 bytes

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