Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8194f1b955e490…

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 21:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6b6365be244a20c9105285d567ab58 SHA-1: 6057381c6e885294460d32a10fc211a6a461a66e SHA-256: 8b8194f1b955e490c77244cd25a49588cec202eaa6c43d44930a2f9b1bac1fbd
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with many pointing to a link farm infrastructure. The primary malicious URL identified is 'https://ttraff.club/wix?keyword=kendra+lust+lex', which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on shopify.com and static.usrfiles.com, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier strongly supports the malicious nature of this PDF.

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=kendra+lust+lex
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/jupabupetefizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/jexazesazowidefi.pdf
    • https://cdn.shopify.com/s/files/1/0459/2772/7271/files/30570371754.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/wosuxomotojatew.pdf
    • https://static.usrfiles.com/ugd/b5472a_d99bfd2ce6bd4fa0819e4a2594d4b674.pdf
    • https://static.usrfiles.com/ugd/7598fa_fefc1a334df64d999ae674f0ac258d3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d43d1519814115b32301c81109aad9.pdf
    • https://static.usrfiles.com/ugd/b8c837_359302ef7ad94a2c92cf42d94a96c43f.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_f57a7c83b9fc4038893987bac1c0b0c8.pdf
    • https://static.usrfiles.com/ugd/7a11b0_224d8ffe9eb64a5db414dac069694886.pdf
    • https://static.usrfiles.com/ugd/739437_72c74afad2594df69e93076284f9d622.pdf
    • https://static.usrfiles.com/ugd/b8c837_a45926fb051d41e8aacf8757528a5a29.pdf
    • https://static.usrfiles.com/ugd/6290de_ac0b4c02b0f5455fa92f264af46b64e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://static.usrfiles.com/ugd/510a18_fb5480b8693c4139a02b23f53d36dcd2.pdf
    • https://static.usrfiles.com/ugd/353d00_dae301cf58a14a979e966e532bec4792.pdf
    • https://static.usrfiles.com/ugd/b8c837_59576f33e5104edd9ab1cbd62367a1f5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004917.bin
06648eea7e9254d4b15e23758b3b635a05c57e37c756bda669a241045b5c9d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4917 4856 bytes
font_01_sfnt_off000059a9.bin
7e4a96b55c73836ca377017602d0e476a823e74b12bbf5c5654c5db14f0ef4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A9 9792 bytes

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