Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd33e252b2ff639…

MALICIOUS

PDF

46.7 KB Created: 2020-09-01 10:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86d2ccbe2efbc4b77e64df44b4b36a71 SHA-1: d40509e38454bd984c6930846cd5066d9c78d1e8 SHA-256: 9fd33e252b2ff639aca84aebd545b138d98eb303941bc2d898973fd830ecc7ca
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=importance+of+collaboration+in+the+workplace+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links, many of which point to 'static.usrfiles.com'. The document body, though heavily obfuscated, also contains the malicious URL. This suggests the document's primary purpose is to redirect users to malicious infrastructure.

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=importance+of+collaboration+in+the+workplace+pdf
    • https://static.usrfiles.com/ugd/b8c837_0059d019dd9447f2a0ece78b553d13f6.pdf
    • https://static.usrfiles.com/ugd/eb4c03_c0b8781e5df6483b9e260bd16c086f82.pdf
    • https://static.usrfiles.com/ugd/4b7290_5d682d268a2146e4bb6a03172fdcbc35.pdf
    • https://static.usrfiles.com/ugd/b8c837_f387e4aade1d4fa9b16ff9bab8f379b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c4222a2bb39416ab97e7e796939993d.pdf
    • https://static.usrfiles.com/ugd/1e32c2_f1690d69c2da4f18a3388c0d67b960b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_aed81ba7b08a47d29e8023889db43d12.pdf
    • https://static.usrfiles.com/ugd/defdb4_5d0dd94f53c74afd9f47135651f44909.pdf
    • https://static.usrfiles.com/ugd/a76634_f1fb8ef6cc184451a0b8bbb8de193001.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_732e946bd4d14ee9933b82be07bf29c0.pdf
    • https://static.usrfiles.com/ugd/1cfe37_c02cf4a72724490cbf0d21effe37b347.pdf
    • https://static.usrfiles.com/ugd/3ce946_1aafdc5cf23c408ab4000f24f817129a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d555d847c9024a99bd9a694c86e40bf4.pdf
    • https://static.usrfiles.com/ugd/0f5b72_3b6cb50109cf403f9b8b4c5c47ee71f0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b05.bin
868303c58a28ef8a52498aa67b3d0dd9d75eeed25dad11e89d7a9f3a8fd46877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B05 5240 bytes
font_01_sfnt_off00007c9b.bin
164b4f5f497f548041afde8542adbb6d69d4451326eef4345195e99a9faec551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9B 10288 bytes
font_02_sfnt_off00009fbd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBD 4324 bytes

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