Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86bfac5c6494dbb…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 22:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f4c7dde87667760e6f524a5f3b9e27 SHA-1: fcd6638e665a5fc44a85c2a5c71477e34ace8fec SHA-256: b86bfac5c6494dbb524a630295dbca1634da5e1bf906f33572517295bb43313d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'broken war warframe build'. The document also contains a large number of links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=broken+war+warframe+build
    • https://static.usrfiles.com/ugd/b8c837_d26cb12c52a44130914d4c5577b4c534.pdf
    • https://static.usrfiles.com/ugd/b47706_67bf5e962d23486ea62856d1dc90a500.pdf
    • https://static.usrfiles.com/ugd/b0b521_4e8f9dfaefbd4d06a4cf4a8b0294a19b.pdf
    • https://static.usrfiles.com/ugd/7ff653_4af1b6dae15a41aab40a9ac42a89d648.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28afd06c8264c08865d04d662f7ae40.pdf
    • https://static.usrfiles.com/ugd/b8c837_d274c9f52c3740d0b0c48013583d06c0.pdf
    • https://static.usrfiles.com/ugd/865d50_f88c90512938426da9c54e94f968b0b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dd1d581fa7e47719c9a1f79b245599e.pdf
    • https://static.usrfiles.com/ugd/76156b_97932d4bade84a5392900f397f1bb83c.pdf
    • https://static.usrfiles.com/ugd/b8c837_df63b85fd3264a9bbd3d9676ca701a0a.pdf
    • https://static.usrfiles.com/ugd/221f3a_50875b6baf064668a3b238128ad58372.pdf
    • https://static.usrfiles.com/ugd/67e251_fcd65ded83f94fce98cfb6e6e32dcbe3.pdf
    • https://static.usrfiles.com/ugd/a382ee_1a84e6c15bed401d8c3b4f95e5bcef75.pdf
    • https://static.usrfiles.com/ugd/b8c837_988bedc97cdb49f8883d70279d691a8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ca48d9cf1ea42d6b622902e88f03f13.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_off00005561.bin
ccfd35ddb89477275b8047efe5429a97b44099df04392e4c3a28076192fbd5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5561 5020 bytes
font_01_sfnt_off00006663.bin
a8b97887a0ecf8cffc1498b026f60daab87a2e0d9a848940bf4413cc2ce8d3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 10252 bytes
font_02_sfnt_off0000895c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895C 4324 bytes

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