Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9d8131dfe6756…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 15:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa1074f6fcdf503246a83c0a58d27b02 SHA-1: 15ec575db26627b64278f23c5a2bdc0171c691a4 SHA-256: 90a9d8131dfe6756628e82ebeda8f3625840b7d2576bfdb423712cced02ff78f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=ez+battery+reconditioning+manual+dow'. This URL is presented within the document body, suggesting a social engineering lure to trick users into downloading content. The presence of numerous other PDF links, many pointing to Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. 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.cc/wix?keyword=ez+battery+reconditioning+manual+dow
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/ap_grama_sachivalayam_exam_syllabus_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/buzubip.pdf
    • https://cdn.shopify.com/s/files/1/0449/7971/6264/files/net_framework_3._5_full_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8185/8214/files/easy_campfire_guitar_songs.pdf
    • https://static.usrfiles.com/ugd/b8c837_04244193227144738393786ac1a82aa0.pdf
    • https://static.usrfiles.com/ugd/0baf77_477892af2b13498b84cee67679b189f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b7f122c35bf4c06913c209b901232f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c77fb85d184628a4a0e70d95ea4881.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc18f2353b8e4aadb27231dad9d8135e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.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_off00005edf.bin
af2d6d923881eb2247cf21cf2497faf7c66ab921cb0766fc4fae10c840203d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 5420 bytes
font_01_sfnt_off00007150.bin
3c13d681e6254c3816f036a14b568e68ff4a57f718385cf0eac9b5219aa77954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 9928 bytes

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