Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dfe3ce71962639…

MALICIOUS

PDF

65.7 KB Created: 2020-08-30 18:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef46fbcc62f79b84091d6b9fa21dccc6 SHA-1: fd71b7cb2f8b5862d8fbf441f063ba2298bc1847 SHA-256: 81dfe3ce719626391741191d39921e54b4dbfd81c4c59f9cdc503ca2381f1929
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://ttraff.com/wix. The document body, though heavily obfuscated, contains the same URL and a reference to a Shopify-hosted PDF, suggesting a link farm or SEO poisoning tactic. The primary goal appears to be directing users to malicious sites through these links.

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/wix?keyword=what+caused+the+abolition+of+slave+trade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/3858/6518/files/ruby_get_class_name.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/77589687923.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/68975879760.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/27981183650.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/75968194512.pdf
    • https://static.usrfiles.com/ugd/bfbc46_55570f9a4ee84482995e79687d1f7879.pdf
    • https://static.usrfiles.com/ugd/97634b_181d77a36ed14eeb95beab9a4ca8e415.pdf
    • https://static.usrfiles.com/ugd/7ff653_58153169ec8f4e51b7cde5d81bf7c843.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a8c60b9549d4e3dab25bcb272d752c3.pdf
    • https://static.usrfiles.com/ugd/493135_6779b958b58341839fc033634797072f.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/oxford_word_skills_advanced_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/atomic_orbitals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/5838433979.pdf
    • https://static.usrfiles.com/ugd/b8c837_a38d6fa4cb47484080ed3b800154c22e.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbef19994c02481a98afd43b7786c9c2.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_off0000b63a.bin
6885880b825b6396b65e87c9cc1473393011b443ddf9df6db21ffa47595f97b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63A 5204 bytes
font_01_sfnt_off0000c7e3.bin
e176f49c2974906429f9e0ec39ce5518a68f118cea3bc9496af4a6403305aae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10708 bytes
font_02_sfnt_off0000ebd2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 4324 bytes

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