Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d69dcb2407bc097…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 12:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfae9bf423e1c072432c7f30e0b71d73 SHA-1: 66ff810bcd295d7cb06a493ea2c0aa5492294222 SHA-256: 3d69dcb2407bc0971c15eb7a0c7d8e3a7a6559cbefcab3dc90e2295b34727bb4
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru, indicating a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and numerous other PDF links, suggesting an attempt to direct users to malicious or deceptive 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.ru/wix?keyword=difference+opening+balance+tally
    • https://static.usrfiles.com/ugd/b8c837_e0e1926c5eaf4f6ca333fe385fc3c892.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fa7436b38b74139a51249956fe8d110.pdf
    • https://static.usrfiles.com/ugd/b8c837_6faa324095fc4f1093127f55ec6fec03.pdf
    • https://static.usrfiles.com/ugd/26481d_1c16ef1b81cc45229c28df4bfeeae144.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cdca71efa4d420dae24df829404ce47.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.pdf
    • https://static.usrfiles.com/ugd/6846fe_bd7148b54028407cbcb2bee7353e9e80.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/58344096598.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5766/files/wusogonudamemidobujal.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/66722811932.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/86832887935.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_off00005e6e.bin
922a52ba5b8ea4259f66c2628df27c8193cfc7037baa550c611420eb5a9ddc17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6E 5244 bytes
font_01_sfnt_off0000705b.bin
c55154bfd94426c6d52c21795cdb4ae065b0916ee9fcea8769f716a0d73613e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 11028 bytes

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