Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9fedd3ff03c345…

MALICIOUS

PDF

33.6 KB Created: 2020-08-30 00:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff319b2adfdbbede38ebdc9beb2c5e0 SHA-1: e57b7d4e774200fc04ec62ea151629c4226d7236 SHA-256: 9b9fedd3ff03c345994c07a085ec335d3dc15c081b7e521b58556803b9d44a21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=teresa+navarro+nude', which is also listed as a malicious redirector. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF documents, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=teresa+navarro+nude
    • https://static.usrfiles.com/ugd/b8c837_1649157441a143e9b41e4bcc65abc0a2.pdf
    • https://static.usrfiles.com/ugd/09273f_ed96c6abc4b14e44a9e53c684d50d4bd.pdf
    • https://static.usrfiles.com/ugd/238140_3f317c7a4d044e89a876c865b6bb3773.pdf
    • https://static.usrfiles.com/ugd/b8c837_f86210dab46140d2aa205a30258b3991.pdf
    • https://static.usrfiles.com/ugd/8de238_0e142fc582884d609ebec0ac575877f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcf3dfdbe8d142f7a2f21ac2f973041f.pdf
    • https://static.usrfiles.com/ugd/01e791_ff43e951619c4dd196031c31716fc520.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e7d8f9dffa49db80747831204b553c.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/47369207283.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/lawewuzobobigufasetezude.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/1231583636.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/1609033191.pdf
    • https://static.usrfiles.com/ugd/b8c837_de81def0044f4711a94fb8dd501c1da2.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_9570f0a840474e469b94bde832c5fee0.pdf
    • https://static.usrfiles.com/ugd/affaa6_9ff2d74352e641f086b4292342dbf790.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_off0000460f.bin
446126c6544039f35a7de5c5fa89dc2a6cf3cd5514419be3d987f194b2e5f8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x460F 4796 bytes
font_01_sfnt_off0000566f.bin
1f09fedbf3c7bed3823f41a3fbae7e114fc767e73ca15e4a94be654faf3d5aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x566F 10444 bytes