Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ff312dd588a55e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 12:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16964d230a2b2a8e1ec19942a6681211 SHA-1: 7443a5c8e24567e17787618eddc8d83821965a94 SHA-256: c4ff312dd588a55e6b11ccfe204481eeac75811c52c91cc8ec979be59c88de66
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external resources. The primary malicious URL identified is ttraff.com, which is likely used to redirect users to further malicious content. The document body contains garbled text and metadata, suggesting it is not intended for human consumption but rather as a vehicle for the embedded 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=kingdom+hearts+3+beginning+choices
    • https://static.usrfiles.com/ugd/19ce5d_38a336b08e1d4ebf99b4d01710e5d247.pdf
    • https://static.usrfiles.com/ugd/5ed537_f7d802a5b8de49138b0eca7f81aa5f39.pdf
    • https://static.usrfiles.com/ugd/c345b0_a64268a474ef45b4a2174a959615bc6e.pdf
    • https://static.usrfiles.com/ugd/b4609a_ea93531cf3864e55a06d38ccca678080.pdf
    • https://static.usrfiles.com/ugd/b8c837_1047222140094212abc2e0fb59586faf.pdf
    • https://static.usrfiles.com/ugd/b8c837_71f8c17080884841932376b293b9c202.pdf
    • https://static.usrfiles.com/ugd/bae363_5c9af2d6fdd94ad7a8b9db5fd63f6b64.pdf
    • https://static.usrfiles.com/ugd/02beb7_15e5b6f17ef44dd59f0dbdbf6b5fe5e4.pdf
    • https://static.usrfiles.com/ugd/10b11f_5c5bdbd6cab74082bf03daef381b8a97.pdf
    • https://static.usrfiles.com/ugd/b8c837_043b9dae59e4418c92cfd24f96691e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_1530973d26244ea58e6931ff51f07ee8.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/gezuwigo.pdf
    • https://cdn.shopify.com/s/files/1/0452/2593/5005/files/factors_affecting_academic_performance_of_students_in_science.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/tuxuja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d4.bin
89c5ee8e72dcd10287017f53c2ff4032421edabf016cc61782f634fef1c3751a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D4 5384 bytes
font_01_sfnt_off000075e5.bin
b68b301cc1d3d1c5c5aae92f6ccbe97dc02e13e83f6b1072d4a3fbb32207ae99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 10040 bytes
font_02_sfnt_off00009847.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9847 4324 bytes

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