Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b6e1d6f05c4455…

MALICIOUS

PDF

34.6 KB Created: 2020-09-01 09:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0496f90bb9d46b7efc8a22fe618a49a7 SHA-1: 0a49a5c86646c1cfd551fa49fe975d76ef920aaa SHA-256: 33b6e1d6f05c445584f0966961267c83d6fb98bb281538b0ff3d84854b714621
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as an answer to a puzzle. The document body, though heavily obfuscated, contains the same puzzle title and the malicious URL. The presence of numerous other links to benign Shopify PDFs suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious PDF. The ML classifier also strongly indicated maliciousness.

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=partitioning+a+line+segment+pyramid+puzzle+answers
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/tv_news_reporter_salary_los_angeles.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/bluestone_alley_original_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/world_of_warcraft_legion_enhancement_shaman.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78055f4d46e43aabdc759bd590ecc76.pdf
    • https://static.usrfiles.com/ugd/9d66c7_7409a6e31a8246bd9a72ad65a5cad4c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_01fac31c07364ba190484afae6da9376.pdf
    • https://static.usrfiles.com/ugd/0b46e6_dfc8c0ca198e4f10a15f375ce2793df7.pdf
    • https://static.usrfiles.com/ugd/a2d007_14b475ec78654d88aaeb1d16f8aaa06b.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/clear_bell_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/14204645319.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/breeding_and_seed_production_of_finfish_and_shellfish.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/21485513707.pdf
    • https://static.usrfiles.com/ugd/32acb1_aced01cd2d944494b3757e7202e6e913.pdf
    • https://static.usrfiles.com/ugd/a107db_1acd2dc6982d473c86b29f69dd5b9056.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_off00004744.bin
98843bc28c119938429080f5a6ef77eeb6887f8c003b036ccbf74f073419497e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4744 5524 bytes
font_01_sfnt_off00005a16.bin
890bb20c15dc3d599c54f2dbeef62c0be3d16da2650818c10782f227648f8193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 9844 bytes

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