Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731afc1b6b05552…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 13:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6737f92b514e8231cad64a966ba45cea SHA-1: 192f33352e6da43f2070e035283d3e624b43e586 SHA-256: 5731afc1b6b05552899c443f8247f732f7e71166aab8b1a70af08f20b1ccefa9
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous embedded URLs. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.me/wix?keyword=social+problems+community+policy+and'. The presence of a large number of external links, many pointing to 'static.usrfiles.com', suggests an attempt to obscure the malicious destination or to leverage SEO techniques for distribution. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure via embedded links.

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.me/wix?keyword=social+problems+community+policy+and
    • https://static.usrfiles.com/ugd/89064d_926a86ece74944508dbeb5305a6f9e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_6121099b4b3845219d4bbc06114877e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbcd355dca4b453e893ae47c2ec72677.pdf
    • https://static.usrfiles.com/ugd/b8c837_a94aac3c002b4c86a93f56b0528afafd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86cc98d60f048a99d863c5b6d6b8d42.pdf
    • https://static.usrfiles.com/ugd/5de1df_65146924c0e843d3be26e9d6a77cbe4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1e2e3ef07f94482aa4b9e13d1ead4a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f92c65d7a024e6a8718f26566f71acb.pdf
    • https://static.usrfiles.com/ugd/b8c837_4912825f01514350b65ddd54cb9076a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ae7500b4a6e419fb4371d4f923e6e19.pdf
    • https://static.usrfiles.com/ugd/8de238_0602642362bf4770aa6379eb67116747.pdf
    • https://static.usrfiles.com/ugd/5ecadc_48b7a2d7e72b4126851ec40bf6a0b199.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_off00005e0c.bin
e5bdd193d6a4a9132e53caec410573f2251054f46eb83f2c2d7f13c41d2c3bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5564 bytes
font_01_sfnt_off000070d1.bin
60f8a6cec801af6ba65843152f3751917980b38ed3e3f98a627b4c304a08049e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D1 10020 bytes

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