Malicious PDF — malware analysis report

Static analysis result for SHA-256 267d3084f6d432c0…

MALICIOUS

PDF

52.0 KB Created: 2020-08-29 21:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f3194d690927d9f2e479a4df782f45 SHA-1: 4905828e850bbd5c291ffd3f1133bf3fcfc69b4e SHA-256: 267d3084f6d432c04c4ff37f4c28fd19788b57b37c9e89db4dc72a6d8c196a88
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of numerous embedded external links. One of these links, https://ttraff.ru/wix?keyword=wall+street+oasis+private+equity+interview+guide+pdf, points to a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and a large number of other PDF links, suggesting a link farm or redirection scheme designed to lure users to malicious content.

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=wall+street+oasis+private+equity+interview+guide+pdf
    • https://static.usrfiles.com/ugd/b8c837_2ec284379e554faf84c97e216abefd89.pdf
    • https://static.usrfiles.com/ugd/b8c837_10d67812611b4847826248b5193855b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e92215b4e45415382f634a0c6f2f504.pdf
    • https://static.usrfiles.com/ugd/b8c837_64d4c30f99834af4941a77d1891491d8.pdf
    • https://static.usrfiles.com/ugd/58a813_cb1cd21f20ae44779f63e91151939c72.pdf
    • https://static.usrfiles.com/ugd/b8c837_857c255524c6409693826e350401f542.pdf
    • https://static.usrfiles.com/ugd/33a16d_088fccb207bf405fb6366b18a441be01.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d6be1a28a548239a37b2455aadb723.pdf
    • https://static.usrfiles.com/ugd/b8c837_abb715f4e3aa43a9b7a73ebd4768e94e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd8c060f0054c4aaf48efed9692b423.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/22080431236.pdf
    • https://cdn.shopify.com/s/files/1/0439/1449/4107/files/bibliography_format_for_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_21cb4e68ab704fa3b620b496ca41d391.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88ebd2631654509ac83e7f3ef10dfc2.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_off00008b13.bin
be4405daa4b3c37d226aad38d124c9fc0c230b66af16b40e92bbcec6e17330da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 5604 bytes
font_01_sfnt_off00009e50.bin
a47c0cef6ec1accdadbcf87f8c4fd001e3e57a6c1a8a4801ad9069c02a70a622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E50 10748 bytes

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