Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec367c0f49cedaa…

MALICIOUS

PDF

34.6 KB Created: 2020-08-30 14:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2ac41790ed962e6853d93b12ac80ae SHA-1: 1a3cc5519de8beca76b3dee24ae08cf96f520305 SHA-256: 2ec367c0f49cedaa924c91908f26d498fe5df01b0aeda8d4ff53de8fd029d4b1
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links directs to ttraff.cc, a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'James Stewart Multivariable Calculus' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links as academic content.

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=james+stewart+multivariable+calculus
    • https://static.usrfiles.com/ugd/b8c837_2308741587624078afb1e30c1397e1a0.pdf
    • https://static.usrfiles.com/ugd/63022f_00b56e6771b7438486dcb1b7d29e5206.pdf
    • https://static.usrfiles.com/ugd/b8c837_1da48d54109c46d7999633c552ef3fab.pdf
    • https://static.usrfiles.com/ugd/3eed2b_b58fafa92c0c4f799e839f37fb23b0eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_10a7d7fedf6448ba81882450d8f9e622.pdf
    • https://static.usrfiles.com/ugd/d5cf39_23964f8464fc429fb1970669a23b6d58.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1621/files/15432148903.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/incident_report_police_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/pubibezulegolemutozip.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bf5729d17f74ebdada24755f1b99802.pdf
    • https://static.usrfiles.com/ugd/e3ff21_645c77e8c62247d59e050c68d6434daf.pdf
    • https://static.usrfiles.com/ugd/b8c837_84ee71002a7a480796b8404d892fec90.pdf
    • https://static.usrfiles.com/ugd/5e8de6_c0ecffcc4807419a9fb8b201eba95a81.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_off00004ac1.bin
9fae30c605af9fc27a4f29b0d94eaf1ce59967b746df2ef338f4887a751a631e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC1 5224 bytes
font_01_sfnt_off00005c7d.bin
e9f91f19ee55ba381715e58d0b7ecf01788647b52a83a1cff5fa66951c0d7ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 9760 bytes

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