Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3af0e161750bf88…

MALICIOUS

PDF

38.7 KB Created: 2020-09-08 11:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1e6447299f5628a761325b7be77d12e SHA-1: 66cd53f448d22a985e9e3993b1e28e01ea2afbac SHA-256: a3af0e161750bf88eb7e7de87f9646e3c0dd555c035ed7b2b921c1cbae4e703e
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.me/wix?keyword=tagalog+crossword+puzzle+with+answer+free'. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. No scripts were extracted from this sample.

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.me/wix?keyword=tagalog+crossword+puzzle+with+answer+free
    • https://static.usrfiles.com/ugd/b8c837_56c39cf3fef043de9d788a6861ad37d6.pdf
    • https://static.usrfiles.com/ugd/74c34a_b7c17651bfca41038515b519a6536352.pdf
    • https://static.usrfiles.com/ugd/1decf9_6ad61a9854f34983a73ebd0cc0008535.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/child_adolescent_and_family_development.pdf
    • https://cdn.shopify.com/s/files/1/0451/0013/8661/files/guru_graha_stotram_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/second_conditional_exercises_perfect_english.pdf
    • https://static.usrfiles.com/ugd/4aae87_2046590648c04c79a8c10a7adf5b3433.pdf
    • https://static.usrfiles.com/ugd/e5a943_b00ce79a09954f2889762fa980a493e3.pdf
    • https://static.usrfiles.com/ugd/c63bf9_5466fd7e53d042f19dd4e5552d335aa2.pdf
    • https://static.usrfiles.com/ugd/abd6ea_4e49ee02f0d44f4096d60af206768410.pdf
    • https://static.usrfiles.com/ugd/8b49c6_41cdea83d7054668a37a21276c6e13ca.pdf
    • https://static.usrfiles.com/ugd/93971e_daf7928b849742b6aa1f6d3623bacbd6.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_off00005823.bin
5d32e7be020e0e794173aaac61acf5b058f2d1d60836616d15160ecdac2353de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5823 5508 bytes
font_01_sfnt_off00006af7.bin
5f847b4faa36517112a001414974f2f182b1a458508de736ccb848c090437410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 10356 bytes

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