Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1ce91096b59337…

MALICIOUS

PDF

66.1 KB Created: 2020-09-03 17:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a331bebb3e1a776860cb5a15b22c448 SHA-1: 0f427edb62a414a2f35d8450aecdd24d81a52af4 SHA-256: 9e1ce91096b593375a7d472de86cd2e251421bccf8a52a18dbca08c6a91811d4
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=stir+casting+process+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The primary attack pattern involves tricking the user into clicking a link that leads 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=stir+casting+process+pdf
    • https://static.usrfiles.com/ugd/824332_9317dd5ebca84c1e837fbadbe834576e.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd228b7b8a34489880d51d81f03bf33.pdf
    • https://static.usrfiles.com/ugd/c33f71_24739f318c9f47b8992d5c8a2ce7be30.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a3a734cf46e429b9e3999b0607068bf.pdf
    • https://static.usrfiles.com/ugd/5e8de6_6e09422168194fde8ba6dc42b7058d65.pdf
    • https://static.usrfiles.com/ugd/1f5cef_e07157a606604cf8b98f5d6e4b8cc02b.pdf
    • https://static.usrfiles.com/ugd/b8c837_95a2de1656cb4c7db8a4ad7c9169c6ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_a054bf630dbb487b9970bd36e6cc5104.pdf
    • https://static.usrfiles.com/ugd/585b1d_9dd666c7839441fcad73cfddd53b744b.pdf
    • https://static.usrfiles.com/ugd/0a052f_8dec9b2f6c1d4156a3d810337ceead87.pdf
    • https://static.usrfiles.com/ugd/d99ef3_921120e0f40541379bc98e9a537edb3f.pdf
    • https://static.usrfiles.com/ugd/625844_c1b56572bbe94f1bbaa48c05ee85e913.pdf
    • https://static.usrfiles.com/ugd/e5412a_226cbf9d1b914065a6549632f51316c2.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/
    • https://static.usrfiles.com/ugd/b8c837_a05

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e6.bin
adc7df2abd06e4c18272f4ea57dda27a41b5bfc4d527f1e14ade6f61b98a5e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 5184 bytes
font_01_sfnt_off0000ca7f.bin
7e8dd117eebc62a598b7c258e3f2673e0d7523b0f50b73bc3ea3ac5a61b95a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 10240 bytes
font_02_sfnt_off0000ed8b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 4324 bytes

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