Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91680b92d11f357…

MALICIOUS

PDF

42.9 KB Created: 2020-08-30 16:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48662d75542dbbe8987d53b997c29de SHA-1: 1a0fd5e1b8a3212e73d3d3a383d1e887e845fb96 SHA-256: e91680b92d11f3575f0a728c9d466c407ca5ee5fe3179ef444e7543921d2d045
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm for SEO manipulation. The presence of 'SE_LOLBIN_RUN_COMMAND' suggests that the document may attempt to execute commands, although no specific script was extracted to confirm this. The primary IOC is the malicious redirector URL.

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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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=adinkra+symbols+png
    • https://static.usrfiles.com/ugd/18f527_27d36e28b8e54fbba5e366b76663a9c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_74ec6464101441d39c153b579341dc39.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ad9e121e30941b399d137c18de57ba9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3266973cf40d4bb08be5c98beabdb23c.pdf
    • https://static.usrfiles.com/ugd/d1d005_326a39bc153947f6ab26f0164b862c7c.pdf
    • https://static.usrfiles.com/ugd/b56239_77a41e2b9aba4e528fc69591852102a4.pdf
    • https://static.usrfiles.com/ugd/97634b_8615b15a8fdf4d37ba118ce3559a7a3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_41401a2f0eea43b1b83d15ee84866c36.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4f0ebc1dc04cd281f6761e5a259a00.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/zadepokojibugokijefobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/31962296867.pdf
    • https://static.usrfiles.com/ugd/ca300b_838f874896ac4a3a80e214172b748842.pdf
    • https://static.usrfiles.com/ugd/b91566_d09aa5d684f445c6a23d0c1d1e732751.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_off00006882.bin
728a5c97e436b0f5269ffcc399f92cac6e5338cc1c538465223a6c3dec83119f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6882 5572 bytes
font_01_sfnt_off00007b65.bin
3d944b5d1829ac3e17b392e809132c3e8f14348d799afbcfa5ca59377b8764e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B65 10568 bytes

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