Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3740b4c87b4928…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 22:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2da9923c9847160e33461cd66a4d3a SHA-1: 6b02171a77010bd62b35266d95f5cd79a1b5694a SHA-256: de3740b4c87b49285b30109603bc11dbc84827d36d234719c9b51897c0c0475f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=letra+de+la+cancion+happy+birthday'. The document body, though partially corrupted, contains text related to the song 'happy birthday' and references the PDF creation tool wkhtmltopdf, likely as a lure. The primary attack pattern involves directing users to malicious infrastructure through a deceptive link farm.

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=letra+de+la+cancion+happy+birthday
    • https://static.usrfiles.com/ugd/b8c837_79534306ddc0417b8f14e12d062df2a6.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_661d3993a2d34fa7a2bf97ec6e71394a.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_5c71d4ae9d02426f9c115e009a708597.pdf
    • https://static.usrfiles.com/ugd/cb4a18_298ba2a232d64c9cac7ab7455e15d1a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_928d4ae96bb3437abc9af4af673dde39.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a25227efe24efa84f4228e272ced14.pdf
    • https://static.usrfiles.com/ugd/b8c837_612b827bc8e34a2eb1d2979b865c90c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e71e2132e20b4d69be56b8fe8620941c.pdf
    • https://static.usrfiles.com/ugd/0511f5_c35d25de21ab4822a59eb51762171b4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa41ffa18ba4e1197b953e9ff1370bf.pdf
    • https://static.usrfiles.com/ugd/b65acf_d94e517d0aa74a8684eb661016999e51.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_1a354e3cbc724f459c42d4ed0fdfe424.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c5d0e8ef8cc449fb11bb7d577dc25a8.pdf
    • https://static.usrfiles.com/ugd/d3758e_971455383e4a4e86b16171630ca30916.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_off00005c26.bin
dc424abad527c78abaf00c8ddf51d2487e6292e2c7bc9e454276ed3f44e9ebcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C26 5164 bytes
font_01_sfnt_off00006da5.bin
f84b44afc0bf959ca7c2b984e5daa62b1a13960f45a64a90bab3fd05fb3a0e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA5 10528 bytes

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