Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdb29079ca7d90f…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 18:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46868afa439eb89cbd091c294a18de7b SHA-1: 219da23c9f5cf7cb305373b7d2fea8e65f1619ca SHA-256: acdb29079ca7d90f19eec4085b44a4c41a7dc3bb7a9455ba80d28c1c087262bc
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the redirector and a list of other PDF URLs. This suggests a link farm or SEO poisoning attack 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=critical+care+notes+clinical+pocket
    • https://static.usrfiles.com/ugd/b8c837_3d8441a70bc44e55ae114e39340b9f0a.pdf
    • https://static.usrfiles.com/ugd/067ecb_a85147088cb047edb19ed0deaba01e62.pdf
    • https://static.usrfiles.com/ugd/9e41f0_c0b74316eddd4d84b758a5193cba9bcc.pdf
    • https://static.usrfiles.com/ugd/3ce946_c24c3482a6df4f02a0a6d9a0412dcc7f.pdf
    • https://static.usrfiles.com/ugd/b11f6d_c7d41152419442039329ff81c171eb84.pdf
    • https://static.usrfiles.com/ugd/b8c837_040c7584a9a24ecc9a3cd31e372d9080.pdf
    • https://static.usrfiles.com/ugd/451a43_9b524e3f68a646d198e4cc22327085ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_a939c1e33d81480ca36b718dde4ebfaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_80d06a40ee0e4830a329fd06d61ebd6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_be9f28fe57fe4203af86192898d17ca9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0932aae6ee14bddb0d2923b05b57e8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3da5ac2fce4e4f96a5126c5a34632d12.pdf
    • https://static.usrfiles.com/ugd/804ff6_9986cf8889f84453b60fecf00e13ac9d.pdf
    • https://static.usrfiles.com/ugd/cc03df_821c68ba42d14de7a615db9ef57c3bf6.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_off000049b1.bin
8dea595ee7d2b7c0fdb3893b13fd363b8fae8a8ab02bd8e5a4d28c23d8f1f777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49B1 4896 bytes
font_01_sfnt_off00005a62.bin
7ddb68bdcb10313e88f13b0c72e81b61671c007686d5297feb82361f72a1d5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 9732 bytes

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