Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ef4adcf36ffd94…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 04:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e198da4d675179758d495272199eeee SHA-1: e0335a3312a61c63991c769a5c7f661ac55d3696 SHA-256: b0ef4adcf36ffd9480ce4980dd1ac3a9a3cd6122132bc804eef59f8b604fd009
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, disguised as an administrative notice. It also features a large number of embedded links to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. No scripts were extracted, limiting further analysis of the payload.

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=acta+administrativa+por+retardos
    • https://static.usrfiles.com/ugd/ca9b0a_ba596e74927046a886c329f7442ced25.pdf
    • https://static.usrfiles.com/ugd/837d34_508e4ffd281b492280cebf5be14ea601.pdf
    • https://static.usrfiles.com/ugd/238140_507c50a43fdf42d696b9cf17b98b8548.pdf
    • https://static.usrfiles.com/ugd/05900a_6239aa8925d448a5a89bb4c3d3b83f4c.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/siwubu.pdf
    • https://static.usrfiles.com/ugd/f967ac_9812b283f38b4856a3d971e7221da33d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc37905c63864e108382a3c83f22ecf5.pdf
    • https://static.usrfiles.com/ugd/5a1791_0c3bc7d9bd5647f5866f0e4eede6fa44.pdf
    • https://static.usrfiles.com/ugd/5a1791_93375f3738ed43cabac2f012770adff6.pdf
    • https://static.usrfiles.com/ugd/2c608b_64a408bdc87e47b689f094bee0a29180.pdf
    • https://static.usrfiles.com/ugd/b8c837_dacb405f5c0948269e918c9157dbddd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a70e80a52f3a4c23bb7641c38ced28af.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_cc37905c63864e108382a3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006119.bin
dc5112b2746e71c939f6ce90f7bc7780b984601b9432722b840d54bc5488b740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 5236 bytes
font_01_sfnt_off000072d0.bin
210f6199bc3d4dc76f39e07df3a67acf4ceeba173475a3341bd48817c1b3f701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 10920 bytes

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