Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3372c05d47cb4b…

MALICIOUS

PDF

51.6 KB Created: 2020-08-30 13:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bbd353da0e77d1d0068d4d372f34ba2 SHA-1: 450e5762169eb75e67ee7c92f66d0d44f8dbafaf SHA-256: fb3372c05d47cb4b8d2f8354a0b9f06a95afc113bc2f337369997d4bcb974369
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=primeiro+molar+superior+anatomia+oclusal'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous links to external PDFs, with the primary host being 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL and references to external PDF resources, reinforcing the attack pattern of luring users to malicious sites.

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=primeiro+molar+superior+anatomia+oclusal
    • https://static.usrfiles.com/ugd/cec570_65cf4bce587f4299854c300ffe77291b.pdf
    • https://static.usrfiles.com/ugd/271e65_0b55c1dad5e04581a92e6cd17f617c3a.pdf
    • https://static.usrfiles.com/ugd/6116da_fc77820e4b824d66b81d1e567aea7978.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ebbf8250bd9413c8ee89fee0159f020.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_79e73b47e35c40818182f0849cca6aae.pdf
    • https://static.usrfiles.com/ugd/cafc24_7e95f877770d4835950d434d1fd4da67.pdf
    • https://static.usrfiles.com/ugd/d1c05f_82c1d39026884e1b91fbe8ea62604ba0.pdf
    • https://static.usrfiles.com/ugd/bae363_c4001738259a4bedb16238d6c5731579.pdf
    • https://static.usrfiles.com/ugd/accd1f_9ba9172dab4741cb9241e90fd4824690.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_ba29393457c9452c9529241453157436.pdf
    • https://static.usrfiles.com/ugd/5be868_f865bec538d74054b0a825ff5bd7a037.pdf
    • https://static.usrfiles.com/ugd/8b9728_bcefd6aa75e7401799d503678f87e7f2.pdf
    • https://static.usrfiles.com/ugd/93c935_7365b36ab01845c1a5765a259ad900c1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c96.bin
daa2a531be760d7cedd377716705d7afe89ae0d0cbcf0d8973f0a481e8b9f6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C96 5080 bytes
font_01_sfnt_off00007db5.bin
e271d7bbb2b04e31e0ef18104f67b3415b140189c59eea2841be1ebb9217fad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB5 13384 bytes
font_02_sfnt_off0000a692.bin
2566b30530a542f1d63357e7dc8b6e734f767231c99fb4db6f884f28f625d9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA692 17724 bytes

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