Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef53baa8c1b9ac20…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 10:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98309ae888af41500b99a1b4e1268ba SHA-1: f115877d1228674a32098b9bbf7c7712a03f1ab5 SHA-256: ef53baa8c1b9ac202a3f03c65e244703edd4380ebf6ee9c73660f607d95c245d
150 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, with one identified as a malicious redirector. The presence of numerous links to external PDFs, many with numeric slugs, suggests a link farm designed to manipulate search engine results or distribute malware. The ML classifier strongly supports the malicious nature of this document.

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.club/wix?keyword=thanatos+assault+build
    • https://static.usrfiles.com/ugd/b8c837_53b723ca448249d7b193bc810be51e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e3fd9b63754def9f9f155dcc2c4c7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c30d21a8b8c4586b5e78b68638c2b08.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.pdf
    • https://static.usrfiles.com/ugd/b8c837_a450ef3f7706412da39a931cc7bf7de8.pdf
    • https://static.usrfiles.com/ugd/18f527_8daafa8c96004900865a826092942212.pdf
    • https://static.usrfiles.com/ugd/b8c837_75215d55ffe24d41beb6b5705f61ffa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_165ba7408e5c438182cb6fd99e60f9c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e687ca5b48b44097a468b50f12af48fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6179b3ed0bff4befaad311c9379ff390.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c9a36911d6446bbacbd7eca97a881b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_18a232c8759f4d7281a2f901e6568b7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e8723e5c2844bbfaa6b46d80c58e448.pdf
    • https://static.usrfiles.com/ugd/b8c837_98ac83487c3d426ab1a18b3b5ffe185f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc0cae447a8e4be6bcad210245acbb48.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_off000070e4.bin
e7fa5f295d6219f21269484bd92d270f31132174f9513b9f3dd6d7e9b0112549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E4 4908 bytes
font_01_sfnt_off00008182.bin
1cde8227e2bcdc1c9577b938e17c77f1d9d3e573171aadaff1c3556e12e4cd85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8182 10208 bytes

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