Malicious PDF — malware analysis report

Static analysis result for SHA-256 627a50510cbf9b07…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 10:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 521942c7a492ba9b9f7c1d2892bb9f37 SHA-1: fcbdbd4dc9ecda4789b6d9d6ad3c489828bb9de6 SHA-256: 627a50510cbf9b07f277864d931a820b793fbff58397ecd0c3bd2306396e4f77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely used to obscure the final destination and potentially for SEO spam or phishing. The document body, though heavily obfuscated, contains text fragments that suggest it is masquerading as a guide. The presence of numerous external PDF links, many pointing to static.usrfiles.com, further supports the SEO spam or link farm hypothesis.

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.club/wix?keyword=waterworks+dungeon+wizard101+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_265a730817ca492ea2ea61f626ffaf0f.pdf
    • https://static.usrfiles.com/ugd/565485_db1a2a5388754fed9949ea2cd662a72f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd5ef37642bc4873ac13c8510e4a1d63.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_ad13fda50c39473e9f21d931554646e5.pdf
    • https://static.usrfiles.com/ugd/83b1b3_4f64ab3460dd4020a303ed6c790627b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_252bb4464eba48129b44f48d3fa92da9.pdf
    • https://static.usrfiles.com/ugd/de60da_3e7ee0f8b9324d8b918b9046601fc119.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe8c231f58e4478fa6e538adaf562164.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_2094f512152d43b3876d3ca466339173.pdf
    • https://static.usrfiles.com/ugd/b8c837_517b4ec932634a7c88d540facb71d5c9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b7.bin
43b3171317dc382b3c723f9cbed0aa34bac5f1c46d2f1fd07ba55cafaea6af73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B7 5376 bytes
font_01_sfnt_off00007437.bin
0ef33aab25c01fd93e51ac70c38abed4e6340b704edea015482ff241f4d0510c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 10316 bytes

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