Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1788077b15539c…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 23:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91037ee3b43445fac1bf297f47e6d465 SHA-1: 6edcea9b7a54464a6081b1094174c664d67aab98 SHA-256: 4b1788077b15539c37dd02f2c1ff25233dc9488293a5eb12784155737a024cf1
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, identified as a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=cervical+spine+ct+guidelines', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links to external PDFs, many hosted on static.usrfiles.com, indicates an attempt to obscure the malicious destination and potentially leverage SEO techniques for distribution.

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/pify?keyword=cervical+spine+ct+guidelines
    • https://static.usrfiles.com/ugd/0adedf_4576ee4e8a9d491391d6077872a508c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a45e558f3324f9fa88b2b70a111708f.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbed24747424c868d89aeb25c9ee842.pdf
    • https://static.usrfiles.com/ugd/3f80ec_85a95a1444d54a8eb30f53ce6eae10eb.pdf
    • https://static.usrfiles.com/ugd/d1c05f_9b14fab48ec74bf9b3981da91db70838.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a25227efe24efa84f4228e272ced14.pdf
    • https://static.usrfiles.com/ugd/b8c837_12b032929c1c4d90a34db89513d70f04.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/89714590541.pdf
    • https://static.usrfiles.com/ugd/0e2875_b20f7c09f59842f887ffd5ad3b588dde.pdf
    • https://static.usrfiles.com/ugd/1f5cef_e3beab59fc9e489fac6c15b182e91d4e.pdf
    • https://static.usrfiles.com/ugd/f8de3e_50864e4225cd489e8eb2c500b1e1fed7.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_off00006b89.bin
78ce74299155d42fd8eeef64322d87deded113b5b2ded78d034b687a68fd9d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 5208 bytes
font_01_sfnt_off00007d4c.bin
a6cde83024bb51d0e51c303341d4ff300c3aa1a3b43b1e823924b11f1a442792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4C 10376 bytes

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