Malicious PDF — malware analysis report

Static analysis result for SHA-256 b754718b74eabb49…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4eceead79fc09434939f66dfe685407 SHA-1: 6f4a9c817559146977311725cb7e41ecc6e71de1 SHA-256: b754718b74eabb49ece7037db0bb3a709ab539055727a3076abceabaf8251eb3
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is associated with malicious activity. It also contains a large number of embedded links to external PDF files, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to a 'Google form timesheet template' and the PDF creation tool 'wkhtmltopdf', likely serving as a lure. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=google+form+timesheet+template
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/gold_dust_conan_exiles.pdf
    • https://cdn.shopify.com/s/files/1/0448/2659/1389/files/juravabidozidenaxovap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9611/files/sewoso.pdf
    • https://static.usrfiles.com/ugd/5af86b_50b85b011a654e0d969584400dc54f43.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ab783d66b624c129b02028b7d30d5db.pdf
    • https://static.usrfiles.com/ugd/c618e9_17a7e5817ecb4dc5916204f09e78cbc9.pdf
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/24310711679.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0590/files/gufuvux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/32171644697.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/accessory_digestive_organs.pdf
    • https://static.usrfiles.com/ugd/93c935_8f8b35f369174397b4276ce94db49de2.pdf
    • https://static.usrfiles.com/ugd/8dde66_af59c8e3335e4811b6bfbd8980a685de.pdf
    • https://static.usrfiles.com/ugd/f967ac_a513851151dd4569ac04c34155bb1b54.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_off00005b06.bin
635d481f24dd19f97c37e7e2c5cf1c773222d9ee2e50dbfd80489438f8b315c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 5344 bytes
font_01_sfnt_off00006d10.bin
00a1b253ec6e2e43db15621fb61c18340907ffad0cbb785945e40329cd5d72ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 10120 bytes

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