Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6d05a85553fcac…

MALICIOUS

PDF

37.9 KB Created: 2020-09-02 01:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fdb3e096336b70ff55f6efa199df5d SHA-1: 6021211a9356eff64e991415ae1639e9a662c8cb SHA-256: de6d05a85553fcac1d70ce128507903df42871ce9a7c2f380424d2927f039bb7
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.club'. This URL is embedded within the document body, disguised with a seemingly innocuous keyword related to dietary guidelines. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=australian+dietary+guidelines+saturated+fat
    • https://static.usrfiles.com/ugd/7d21c0_e3600de9a73548dcab7147e0ff1ea385.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e09bd7a86944a7c8b3a8e7710a3ed70.pdf
    • https://static.usrfiles.com/ugd/81ef4b_b0b8594fac004a6d89cbb0e85cd59f78.pdf
    • https://static.usrfiles.com/ugd/b50c55_d2092c43d1dd4d6b9c3a35b1bf814c7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c369762975a41ddad84b8131cc23851.pdf
    • https://static.usrfiles.com/ugd/8b2c09_66e71b3128554bfa841b24b442cf99d2.pdf
    • https://static.usrfiles.com/ugd/9219f8_fa923b0632614e17b4f9e79403aeddf6.pdf
    • https://static.usrfiles.com/ugd/45fd81_980d864d02a04157984e72cab7ec116a.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/xifabijozuxuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/pathfinder_bestiary_2e.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_off0000576a.bin
abcced9b007e35d9ac70b7b0c014f31e0b27c5940c003d1bdc983aaca00c90c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576A 5168 bytes
font_01_sfnt_off00006915.bin
ac2adcd318678e729acc767a7b2dc2cd3b0a3b339d3c1009416b72c7743f6309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6915 9980 bytes

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