Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3684490fbbfbe8f…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c48b10fef4601200d9ceb3be1a5b429a SHA-1: d933adfebf0510e23bdac18d01d47716aa540ed4 SHA-256: a3684490fbbfbe8fde6e96d3f920470928e3d03efe59ff5f80b58bf69309dd60
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=atrav%25C3%25A9s+de+sangue+atrav%25C3%25A9s+de+pdf+de. While many other links point to benign Shopify domains, the presence of the redirector and the ML classifier's high confidence score suggest a malicious intent, likely to lead users to a phishing or malware distribution site.

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.cc/wix?keyword=atrav%25C3%25A9s+de+sangue+atrav%25C3%25A9s+de+pdf+de
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/83013763961.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/70685079038.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/zofanidusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/zevag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/54844521386.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5388/files/rivixov.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/wanugokawodaja.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f7cf313d14c4353b1e5a6a49c102a40.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f0f3d8a588b4fbaaa6e81487594759e.pdf
    • https://static.usrfiles.com/ugd/b8c837_54aff90327a942fe8d998f90f4cc31ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_86c9a4350dd940938455b2054075c08f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e77ac6e23bbe420dbf74ac012ce76e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_165550fb41434e53b50c5e88d018a5fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd8446f6b5847ea8399067fa84bd8c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_463de93d2f4c4289be6300a96b299f5c.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_off00006973.bin
29a0b3f8c96593700e0961b61e53535d2056c8533b1532a3c86895eb7d526853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 5368 bytes
font_01_sfnt_off00007b85.bin
b36460c399492f44ed2f8f4d166134de3dc50a3992d4a7dfb5302f2201d1192c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 13716 bytes

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