Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7a1952ba05a239…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 01:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63e3887e846297da0a7943a9f8e13361 SHA-1: 1b51d8794f283c3ac1507c68e7a96a181ea41c8b SHA-256: ef7a1952ba05a2396bf7ad5f08195d4ab0ddb0ccc4015e55d0c999a475750405
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, which is identified as a link farm. One of these links, https://ttraff.com/wix?keyword=clinical+sports+medicine+peter+brukn, is flagged as malicious. This suggests a social engineering attempt to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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.com/wix?keyword=clinical+sports+medicine+peter+brukn
    • https://static.usrfiles.com/ugd/b8c837_58c0e2677d264bdfb97c9b6145d5f366.pdf
    • https://static.usrfiles.com/ugd/b8c837_2100d23ced5a494985e5751a87342560.pdf
    • https://static.usrfiles.com/ugd/b8c837_c70c64c97a5442d1a8edad5b0fde93f0.pdf
    • https://static.usrfiles.com/ugd/225520_7a683daa186c49bf94f5204e3c2f3ce5.pdf
    • https://static.usrfiles.com/ugd/d55797_6f00959c9c124fd8922d3094294d7af7.pdf
    • https://static.usrfiles.com/ugd/aef5b7_5fd3dc619c594821aae28e07c68225ad.pdf
    • https://static.usrfiles.com/ugd/d5d855_1bd2e84447824e76a94c7ecc098b1a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2922f2e2c864870b739e3a005f8cb08.pdf
    • https://static.usrfiles.com/ugd/b8c837_65373540caa0459fa6610c8336131adb.pdf
    • https://static.usrfiles.com/ugd/c836c3_b6e92adf58fa4d10902048ded6164b9a.pdf
    • https://static.usrfiles.com/ugd/d4da64_80e53c0a2f6c45749f0bd8fd8c955ae0.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_off00005bfc.bin
865c89801153d6c0fdc9df056efe89add48e66eee1fb6a7bcbd1eb4c69b75262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFC 5328 bytes
font_01_sfnt_off00006dec.bin
bdd271f9e88a4027dced3957110f621fd03199f25b7a1e475fcdd3539fc62ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 10512 bytes

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