Malicious PDF — malware analysis report

Static analysis result for SHA-256 a528823d09e1fd83…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 12:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b53306ccb279171d6c9e19bfb437fe5c SHA-1: ddefbca08a61ebd00ff54e0f6c9b8ec166f2e18e SHA-256: a528823d09e1fd83355758c683e55b4656fb6338e54964becd4ea962a833cb4c
150 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.com, which is designed to lure users to malicious infrastructure. The file also contains a large number of external PDF links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier strongly indicates maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=adjectives+of+comparison+worksheet
    • https://static.usrfiles.com/ugd/b8c837_cafbaa95d8724e1cbb564a3883c79c92.pdf
    • https://static.usrfiles.com/ugd/b8c837_531bfd49a313432182eb865a40269856.pdf
    • https://static.usrfiles.com/ugd/b8c837_6903332262864fe29263e593f599942b.pdf
    • https://static.usrfiles.com/ugd/9421c8_cb073b953d4e4bc68bb9a7a5402cb097.pdf
    • https://static.usrfiles.com/ugd/8ba634_31bb1c3cc15e42d59aa0efb984fd04f6.pdf
    • https://static.usrfiles.com/ugd/ac72e0_547dd69a05ab41c1ba6230fe38d48e70.pdf
    • https://static.usrfiles.com/ugd/73c254_2da03cab08584f018338d504decf70ba.pdf
    • https://static.usrfiles.com/ugd/409ca8_a5edb135cc294e8485d9b8694f96f7cf.pdf
    • https://static.usrfiles.com/ugd/8de238_28fe0c6282e64861a4a48d49b2c33592.pdf
    • https://static.usrfiles.com/ugd/824332_cf6cd7a347ac4c5c8a3c4ab5cb859504.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_off00005631.bin
50c360c5f35d98e564fc1a57679dd5aeb749312e7ab9b693953052271ab1325f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5631 5644 bytes
font_01_sfnt_off00006946.bin
d76358f2169c762690ea5e36fd287da0a1bf27096da0bf1f0608159ede1fbeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 9896 bytes

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