Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4ac5944430d20…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 16:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45024accf00f1b41392922d80a78064d SHA-1: 761b11e2ffd698aad943ca2945bd9f1f917d71e0 SHA-256: dcb4ac5944430d207581c661ceead908e3536d94351a032064210dbb9840681e
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=free+download+doc+to+pdf+converter', is designed to lure users into clicking it under the guise of a useful tool. The PDF also contains a large number of embedded links to external PDFs, indicating a link farm strategy. No scripts were extracted from this sample.

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.cc/wix?keyword=free+download+doc+to+pdf+converter
    • https://static.usrfiles.com/ugd/1e32c2_230a53ce88e547ae9d5213af581bc393.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_e3d0e542877a4c93849642e8dd787c61.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbd1a2af1ae94595991240fcbf6f8176.pdf
    • https://static.usrfiles.com/ugd/b8c837_574478db8c164d8684529770df75ca34.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4988329c7404ffa87ceea3411f0b592.pdf
    • https://static.usrfiles.com/ugd/b8c837_c190b3b27dab4bada50a12c720818191.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7c462d476e04256a53a9cc320975875.pdf
    • https://static.usrfiles.com/ugd/b8c837_8531fae6c78c472c9f3c122d4992102a.pdf
    • https://static.usrfiles.com/ugd/de65f7_bf28dc72fb64428d811d16d6b064adf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2bc83b541424a16a5283b75bd9271d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b522b4db0354ce3b6b1b87d5fc3bc7c.pdf
    • https://static.usrfiles.com/ugd/6da380_4c84ef1359f0425ab995d9f1120cc2fe.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_off000061be.bin
4809fa89826f9851ae6e5ca122f4cf215370946727d954572261c833f05ff80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 5076 bytes
font_01_sfnt_off0000732e.bin
c2b04758b7951f6f06e29702a0cc490907695d8ee87f54d67a0cdec3b44c1faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 10076 bytes

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