Malicious PDF — malware analysis report

Static analysis result for SHA-256 8450c092787b5218…

MALICIOUS

PDF

51.1 KB Created: 2020-09-17 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73e9bf92ffa6c71f8b039266d13eb75 SHA-1: 24c64b67978739908e47f62f48fb53293bb6e8b2 SHA-256: 8450c092787b521806758831acc13f2dd99a7190af0618ef0a91ffc55be766b2
154 Risk Score

Malware Insights

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

This PDF document contains a significant number of embedded links pointing to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=tankobon+vs+bunkobon
    • http://files.fringeboutiqueto.com/uploads/1/3/1/3/131398000/xedepogozirok-vilut.pdf
    • http://files.crownbid.net/uploads/1/3/2/6/132681773/3199410.pdf
    • http://kojodifo.bvswgirlsbball.com/uploads/1/3/2/7/132741615/pasibabekagawibijew.pdf
    • http://fapasakaw.frank-zindler.com/uploads/1/3/1/3/131397997/8987150.pdf
    • http://xeradokar.hanoverwarriors.org/uploads/1/3/0/7/130776824/5635591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6042a6d3-bc8e-4aa9-94ac-cfc9c869ad1f.filesusr.com/ugd/86319b_044c565b7ec749f29432b41928c0d4ae.pdf?index=true
    • https://9fcf9f61-5b94-4929-9e2d-8de3e263c0c5.filesusr.com/ugd/7dfe85_77dbe2d0514d42749f59932b8525e0d4.pdf?index=true
    • https://4fe8f670-e182-4e32-b4f5-3ace43b74a54.filesusr.com/ugd/891219_ecb9c4e6473446d89ce632c4392ade07.pdf?index=true
    • https://687d821d-9e01-4b72-9fb2-5656ffd81e07.filesusr.com/ugd/516793_ad08232306bd4fe981befe9c9a17a199.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/34148389162.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budazasinopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/brew_install_specific_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/welorubemodeva.pdf
    • https://343aad55-06d0-4aae-ad6a-ced7d1c120d6.filesusr.com/ugd/6f5f23_83a2bf045dd1487e883ac179dcfd545a.pdf?index=true
    • https://1f0abd11-bb3d-4568-9007-2f381263aa4f.filesusr.com/ugd/ca32a8_3d273ed667c74d1c9e55913b2fe58e1b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006da9.bin
a2f139e7684b691a086ff4f1fbb259119535b527cace34f9bc4994303a137aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA9 9184 bytes
font_01_sfnt_off00008c02.bin
b454e3d9b580dc1ef56b9920849831d58a41ffab44409eae9b06c032e64f0441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 4764 bytes
font_02_sfnt_off00009c51.bin
954ce6708485c1ed2e64f53be65ec920f18fce755f43ac4030c564e5228b7bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C51 10316 bytes

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