Malicious PDF — malware analysis report

Static analysis result for SHA-256 b720855714c16155…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 05:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 619f9ed61df2043ba42834ad39b56b25 SHA-1: 8a587b73d9589c172e2b1051f6730cd1c52f0613 SHA-256: b720855714c16155cc0db28887cb1ab977e4b2dfea8a2f8f3ee929845365d0d1
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking and distribute traffic to the malicious redirector.

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=honeywell+thermostat+hold+button
    • https://static.usrfiles.com/ugd/8acad3_20230f6939a64e589d3004b52133bfb0.pdf
    • https://static.usrfiles.com/ugd/2b25b5_5ce951ff1df04becbdd29c9c175ba3a1.pdf
    • https://static.usrfiles.com/ugd/74e905_c64016b0b41c4c63a9a2b528408a9ac8.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/81826631336.pdf
    • https://static.usrfiles.com/ugd/7baf93_5b4ebbffc6924b34b631e198e0069301.pdf
    • https://static.usrfiles.com/ugd/b8c837_08d055e20f954efa84331490402bc89e.pdf
    • https://cdn.shopify.com/s/files/1/0439/0099/3704/files/jagetigewuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/logelowamazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70838758317.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/21539941452.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_off00006909.bin
674e42e07eb27f34921f7be1a83e6e9e086e1a1754b99cf24b74eb3a1b641185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6909 5360 bytes
font_01_sfnt_off00007b20.bin
d8f84f57e0e80088bc8caca8e89dbaeed7b5c8eed4e677764865f320de378dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 10700 bytes

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