Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ce3d20d350eb51…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673eb4e9dab5f55f3b499a3d4ec5cbbb SHA-1: f91a6116dcdf8852eb7e8973accef6d7832ba660 SHA-256: 23ce3d20d350eb51842b70c12728e8fb1f4e9ef71c1e68824852ce10043b9f92
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=vampiras+capitulo+125'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, also contains the same redirector URL and several other URLs hosted on static.usrfiles.com. This suggests the primary intent is to redirect the user 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=vampiras+capitulo+125
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa6813c4b01d422fb9e46132c735b297.pdf
    • https://static.usrfiles.com/ugd/b8c837_19ee4eedaeb04954a20a3e07c9d8c732.pdf
    • https://static.usrfiles.com/ugd/b8c837_7101b0d36d224c09a1dfc957bd7963af.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/86047632163.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4aa6b03043540a28a1ca0aa45a52158.pdf
    • https://static.usrfiles.com/ugd/b8c837_df1ceae2016f47e68a82c1a06d8fd37e.pdf
    • https://static.usrfiles.com/ugd/b8c837_df6f6ee8a33d43d88d06016dfe9240d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_623ac47fcedb40a6b552e5271f879444.pdf
    • https://static.usrfiles.com/ugd/b8c837_7259aaa7c7974f3795a3929b44164ed5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec67cc3a1201451396d892e0c2da5cc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_24eca2a73b324c8b913d0c713845b476.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5da69e4631440b58f7fcf8c8e94b7ee.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_off000063e8.bin
c82d0e567cf2f0d2291c986a35ddbfe756c0ebefe222e25a9a30d8cd6f9bbfcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 5008 bytes
font_01_sfnt_off000074f4.bin
26f45584b517875ec7b6a10cc0340d740392c70a31062b25855b9d75e5746ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 11592 bytes
font_02_sfnt_off00009a5f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5F 4324 bytes

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