Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca8b7df9f8f080…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 14:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb819dbbb702481c21d7e82aa16075f7 SHA-1: 2a5d15a02774b6fed95c85ee3f8081cf4347dbb5 SHA-256: 81ca8b7df9f8f080aaa2ba5215d47ae88163d2e8ec8ba739f6dff436dc98f88e
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=agree+disagree+questions, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on static.usrfiles.com, indicates a link farm designed to obscure the true malicious destination.

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.ru/wix?keyword=agree+disagree+questions
    • https://static.usrfiles.com/ugd/4b7290_ba21e12170f54f2288ccbcd1f655e2ee.pdf
    • https://static.usrfiles.com/ugd/c0b427_1af0796fd52b4ed7a555dbafe1a4f916.pdf
    • https://static.usrfiles.com/ugd/0a593f_efcefa7105e54b5eae4ed16a2eedf34e.pdf
    • https://static.usrfiles.com/ugd/b7ab08_6223aea338794cf583bb903e07b45dc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e37550f5e44b318819e444bdd307da.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/47404219406.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/vigitefogorabas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/40594350853.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/wukoxivusifudifepubulesam.pdf
    • https://static.usrfiles.com/ugd/b8c837_019a09f021114217a5f58feee6ad44b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_64a5360b754243ffa1bec505528476f8.pdf
    • https://static.usrfiles.com/ugd/4dd980_e356292c05084f62906f80938190e935.pdf
    • https://static.usrfiles.com/ugd/08fe48_73d698569b7343d9b66169a0308c6e55.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_off000062a2.bin
b9346bdaef0fb7ff0fc9f450cdb6025d0125489d2b03ef851a4a19eca843f373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A2 5076 bytes
font_01_sfnt_off000073e9.bin
537aebdc731e670ccff6001db40a4e05420099107068a6f35178cc66649d6c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 10120 bytes

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