Malicious PDF — malware analysis report

Static analysis result for SHA-256 259138ed93422d5e…

MALICIOUS

PDF

33.0 KB Created: 2020-08-30 23:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6e0e6fc04a4f669a24e99441c92029 SHA-1: 5a5bd4be0b34465fb02f42dbb56609fda82aa948 SHA-256: 259138ed93422d5e5b2109f28d394d74eb89cfa9d3d59aac1ecfd74674e687e7
120 Risk Score

Malware Insights

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

The PDF was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links. The primary malicious URL identified is https://ttraff.ru/wix?keyword=the+freddy+files+updated+edition+dow, which is likely used as a redirector. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf.

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=the+freddy+files+updated+edition+dow
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e0065230e734c89bf394a82127e6c96.pdf
    • https://static.usrfiles.com/ugd/b91566_c38117cc84a54579a0df50712ed859b4.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_5353034a52a743dba4daf81b57d740b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec3761a84a447d7b0164214c1a47698.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/dusipojukuz.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c86a6a768184e918a51f511b9c0e906.pdf
    • https://static.usrfiles.com/ugd/b8c837_19264833cbd04ddc9aec8a20a8d52c93.pdf
    • https://static.usrfiles.com/ugd/b8c837_a973b37b504147cd9253f887e3dad7d3.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_9291db20c878461cacc70e5a39dbef88.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/45323668678.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/robinson_the_journey_ps4_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/aplicaciones_ofimaticas_macmillan_pd.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_off00004416.bin
cfb72e7d3540b7723a747e339e632511fdedfb69029f463af8f760cf31f7cb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4416 5272 bytes
font_01_sfnt_off00005617.bin
e1a2a54c713adb29de4fda478a69086e69c7a1371dc10875e5e3d8e33f075d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5617 9636 bytes

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