Malicious PDF — malware analysis report

Static analysis result for SHA-256 16755327acd97e06…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c6cbf39ba66424609fb60a7ab07933d SHA-1: 2067d57e0c68c269aea04a091df9c609a5bc00bc SHA-256: 16755327acd97e0656100188d3c79e3e41bd9729dfe0be1fa6977611b5011190
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to game cheats and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.cc/wix?keyword=cheats+for+dead+samurai+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1be480_6d19e3dcea314a03a8753500c72ed67d.pdf
    • https://static.usrfiles.com/ugd/6846fe_511ab439605b4a61b68899a1f1cc7205.pdf
    • https://static.usrfiles.com/ugd/b8c837_22d89e09ffd047df98b25af2dc1b2302.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab7e646ad1c64a66bb9fcb67025c7c7a.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/lumix_dmc-lx7_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/command_line_cheat_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5457d31b2ec4059a31b98aa8781f0d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57a875f48484ecb9c7ba2770793a251.pdf
    • https://static.usrfiles.com/ugd/80c1db_e8d5556fe88b48b0ba6daaa5d9712afc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c650ddaa800435e91a13b4b273b9ecc.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_off00005d50.bin
07467a726189a384f40c3954c4bf05b9b2ea7d650eba1a55429e3a6182ea1951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D50 5152 bytes
font_01_sfnt_off00006eaf.bin
3adf973c37ce816eded14a092710bf36163c87c1db3726dc8b587c31a844ae98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 9968 bytes

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