Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4994640bce7d4e9…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 02:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f323d5e2b385f374db3c544e6cc3ff7 SHA-1: 8b31bb671256334418760bbc3d38ced5e89676ae SHA-256: f4994640bce7d4e93ffa2c3fd851a24e735333cc6d8e425a0c7badfc98d4922f
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=a+long+walk+to+water+free+download'. This URL is likely part of a malicious redirection chain. The document also exhibits characteristics of an SEO link farm, with numerous links to PDFs hosted on 'static.usrfiles.com'. The embedded document body text, though garbled, contains the same suspicious URL and a title suggesting a lure for free content. No scripts were extracted from this sample.

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=a+long+walk+to+water+free+download
    • https://static.usrfiles.com/ugd/0d2908_15e1eca5aff2462cbcca67d613dcaff9.pdf
    • https://static.usrfiles.com/ugd/3ce946_dbdd1a7c2269461a8469015be3284758.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ccc27ae87d3470b8452156fc45d0996.pdf
    • https://static.usrfiles.com/ugd/e4a001_032dc75b38bd4177bbafcc62d98d0e42.pdf
    • https://static.usrfiles.com/ugd/d162e3_9627465a181e4a9687394a8a71f586ce.pdf
    • https://static.usrfiles.com/ugd/de3d83_f84730ec26064607ac9404207191797f.pdf
    • https://static.usrfiles.com/ugd/c345b0_74b1cec4fc244173a75e7c81b43a0e70.pdf
    • https://static.usrfiles.com/ugd/1e32c2_e1037e8628b543618c7e54d5fdf025f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://static.usrfiles.com/ugd/b8c837_a88509c058504f01b420aa9940b59a71.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0ce30be00e344cbada7ca0ea8cfc5bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbb400a36ca84a078d6a91bcc7b9d5d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_950f4480af9747f4ad58c4cec5241e0c.pdf
    • https://static.usrfiles.com/ugd/82e28d_05caf35c44ed4db3907e8c8c1cd62d59.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_off000067cb.bin
70467eb29c64b4de1ac43d06f06884a84c1f7b3ac6e7b973ec25f9da6accdf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 5044 bytes
font_01_sfnt_off00007914.bin
63c89309820001f6c0f9c92f827b9368e497abd76d509f74bd4e8692904c7830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 10256 bytes

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