Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e7e0744d426e36…

MALICIOUS

PDF

47.9 KB Created: 2020-09-01 03:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf61628e3cccd7966ebe477a6d70fc1 SHA-1: a6ce766a6e1a4f895612ec94610bab54488ad077 SHA-256: c4e7e0744d426e3643b90bb27dfa9f4458f094211ee6343ee52c9d33d54deb38
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=fibonacci+c+template'. This URL is presented within the document body, suggesting a social engineering lure. The presence of a large number of external PDF links, many hosted on Shopify and static.usrfiles.com, indicates a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=fibonacci+c+template
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/acs_physical_chemistry_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/vofekewiredekowozarufag.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/36079707886.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/9857997820.pdf
    • https://static.usrfiles.com/ugd/6da380_f500546e53ce4680953c77b7edf07b69.pdf
    • https://static.usrfiles.com/ugd/a467d2_1b444ace6779486c8891c8c7380149d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ec1a1d830b44764a98a65e00688bf9c.pdf
    • https://static.usrfiles.com/ugd/33ab24_f180523e6ab942e9a41c010edfaf9c74.pdf
    • https://static.usrfiles.com/ugd/f84671_520eea28b6664821acd47a2f170c6151.pdf
    • https://static.usrfiles.com/ugd/fd3290_29a12a16d33f40c8bca3ec82828e4cbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://static.usrfiles.com/ugd/74e905_5835e2013ee54db9a99366e70e3b1b8c.pdf
    • https://static.usrfiles.com/ugd/906e9f_7b87f129b02a45deb18d309f633ea330.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_off0000729d.bin
daf519c04ce98ab051882dfdc16c6f0548aca5162b059c02e2f38fc15a857b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 4900 bytes
font_01_sfnt_off00008339.bin
72717b0f240687cbdaf8550e2402367cb8d705ac5bbd7cc3855c6d25ca074b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8339 15100 bytes

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