Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf7dbe93efc71e…

MALICIOUS

PDF

47.3 KB Created: 2020-08-25 17:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0cb91515f4064d093a46cb4f791ccd1 SHA-1: 73a8a8f41d26e701c0efa99027af74f7dd7700a0 SHA-256: 73bf7dbe93efc71e1176a048c6fcc369ffefd6e31c911d83c20b004d5f10d4ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL and a movie title, suggesting a lure to entice clicks. The presence of numerous links to PDF files hosted on Shopify, while many are benign, contributes to a link farm pattern, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=alexander+the+great+malayalam+movie+songs
    • http://lisonit.mathews-engineering.com/uploads/1/3/0/8/130814328/8796682.pdf
    • http://puwixeve.mandipeeklpc.com/uploads/1/3/1/0/131070420/7cf039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/bittencourt_penal_volume_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2173/6859/files/59995881233.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/22133817816.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/60348322723.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/23845322364.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/parositu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/gre_argument_essay_pool.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/12859528327.pdf
    • https://cdn.shopify.com/s/files/1/0460/7839/4532/files/abstract_and_concrete_nouns_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9413/7249/files/game_android_mod_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/kegobopipilabup.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cfb.bin
74995c82bbddfa255cad1cadc5b5d28e138060ba06563f225eaac537f560f79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 5244 bytes
font_01_sfnt_off00007ea6.bin
225a57faa2e4b99235b7746c2f2f9cbfac840ff188ba8dbd62ab9d70177ef8a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA6 10312 bytes
font_02_sfnt_off0000a1e1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E1 4324 bytes

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