Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbaa4bff604dd65…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf4a9d6181776b4869518ac9a31511b7 SHA-1: c028644ee0b1ef2012d8bbae5df2fae1a0d5030c SHA-256: 4dbaa4bff604dd651c081d1f200f2a11f100117547f28f8641964df6b4adf517
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=parbona+ami+charte+toke+mp3+song+dow
    • https://static.usrfiles.com/ugd/b8c837_c45685b6d32848479be1c3c23951e143.pdf
    • https://static.usrfiles.com/ugd/b8c837_f21874f4e02c488e9fd7f7abb3329ddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a0ee9c9a2d6426e806a9a1bb2fd7055.pdf
    • https://static.usrfiles.com/ugd/b8c837_70a1ffe7f8bc4e2f9c2a1297548aa03e.pdf
    • https://static.usrfiles.com/ugd/b8c837_58663ce709c448bca39a3026dc301f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4d1795872284ea3bb9cfaff6d7a7e8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad9eae7bcf3b4f189219a120b63a11f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef21abd4d10d4d0490ede476d398db3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_af0c71f80e8e45a5bc124629d98c6080.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_off00004dbb.bin
0200a866aa60650fc4db54e2a5c9d316e63f22b085a39b417e7708dea07186fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBB 5916 bytes
font_01_sfnt_off000061b1.bin
61aa03f3dc04205995cabf55913b18b8431baa6670be0ccbf09e01545b49f172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 14628 bytes

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