Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19c773bdae53ba0…

MALICIOUS

PDF

134.8 KB Created: 2020-09-19 06:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267c068c47a6bd9c6de11c6635b37029 SHA-1: 2e642f25d900fe03d6dc62db463eaae059f20f7f SHA-256: d19c773bdae53ba0aa8738f5d7179db3ee62f2000273d7c127df63a5de2e312b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=creative%20illustration%20by%20loomis'. This URL is embedded within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous external links, and is flagged by an ML classifier as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=creative%20illustration%20by%20loomis
    • https://3b0d5f92-d03b-476a-bc14-aad8e9f20e55.filesusr.com/ugd/8aba0c_2e93f9c2c54e4bf2bcd897b3f2e2d96a.pdf?index=true
    • https://0ef80bb7-0251-4c24-9959-9b940b179c2f.filesusr.com/ugd/2f7815_dab0f6a50b484c44adaf3510180f07e9.pdf?index=true
    • https://cb894ecc-5ed0-46a6-bb9e-cfd4b226a5a4.filesusr.com/ugd/0cd3a8_f4ec0161e8c04496865267e0a75725ce.pdf?index=true
    • https://99b3743a-e52e-4142-abca-00423336eb63.filesusr.com/ugd/1c8c1e_c66a6e2fd27941ada3247b5c97885e4e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0698/3335/files/52073740934.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/roxumokixeridumizegamu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/sixujuwowumisoruxufezut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3359516262.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/83667290011.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9309/files/22208124918.pdf
    • https://ab7029ce-0100-4e4a-b483-87eb171c80ed.filesusr.com/ugd/a58b01_626308662cc14b20a43f11d8bd34455b.pdf?index=true
    • https://a1337b26-c3f3-42a5-8a60-729164e28b93.filesusr.com/ugd/217d68_46c473cbf79142de9277d0c6ecdb4e6e.pdf?index=true
    • https://da37753b-3f70-4ac5-8658-df1f728bede4.filesusr.com/ugd/ca32a8_d722b2d7db3e44fc91e2e1b76aed099f.pdf?index=true
    • https://a91b70cf-53b1-4702-a1f2-050591b4a805.filesusr.com/ugd/3283b0_5404624a7b6740b09f193ba70fa8f2eb.pdf?index=true
    • 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_off0001bf0f.bin
4e2b766b73d556aa02228786830082e682d64c1dcef69240a58ec6c963d644c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF0F 5036 bytes
font_01_sfnt_off0001d01f.bin
09e8d63e0d6c42eb85e71c0e0361da626fad0a510507f95a49d4b7c6d6abac3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D01F 20068 bytes

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