Malicious PDF — malware analysis report

Static analysis result for SHA-256 832cb0161dd4436d…

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e00d05bda8ed4471d504403cdf5d110 SHA-1: 79a8e332779e11f4c56c345e00457a292ce43e51 SHA-256: 832cb0161dd4436dbb49bf7a34f4bc464caae14b482a6c6fb31a1d5de80340c7
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily garbled, contains text related to a gym machine and the redirector URL. The presence of numerous links to 'static.usrfiles.com' suggests a link farm or SEO poisoning attempt, with one of these links also being identified as a malicious redirector. The file's purpose appears to be to trick users into clicking the malicious link, likely leading to further compromise.

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=gold+s+gym+crosstrainer+600+treadmil
    • https://static.usrfiles.com/ugd/c1615c_537529e8724349e3b8513485fcbf8973.pdf
    • https://static.usrfiles.com/ugd/b8c837_273db06355834ebeb9bc3451295e22a3.pdf
    • https://static.usrfiles.com/ugd/9c0842_24f6d53fbc62469d8984fe968f7122cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b50bcbcf018438aa93353c7cc087134.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a4153a7e19d47fa837278ad535180e7.pdf
    • https://static.usrfiles.com/ugd/0dd040_f617421a77fc480ba1bfea098c21b555.pdf
    • https://static.usrfiles.com/ugd/299074_c9d3da42158741a4b47ffcc279a8f29e.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/47362843421.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/tudolok.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.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_off00006e97.bin
08c1bed03743aede4bfa22b774e57d0dd9d8858230995326e6f729d6506f84c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 5688 bytes
font_01_sfnt_off000081e0.bin
e931f2622dae1ac10e86294a42712c6e228c94513a0ccf843ccefb113bbb68cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E0 11352 bytes

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