Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ad3099a14dac49…

MALICIOUS

PDF

40.7 KB Created: 2020-09-20 14:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31dfc5fa1c53053f70418e8a9ed9b0cd SHA-1: 0033ffc69aa055484179197e326daddb3cc3837e SHA-256: 75ad3099a14dac49b5cf5ce8d677a1bfb2c0be5f37c2666997299786de004b85
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The PDF also contains a large number of external links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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.link/wix?keyword=all+shiny+legendary+pokemon+in+omega+ruby
    • http://sumopeko.dgw-america.org/uploads/1/3/0/7/130740393/remesopugudupe-rupazojusosu-fopulabosek-tusovisowivak.pdf
    • http://files.nooracademychicago.org/uploads/1/3/2/3/132303374/fb947db7e80f.pdf
    • http://tifoli.minjin.co/uploads/1/3/1/3/131381481/8139b8.pdf
    • http://files.christiantedeschi.net/uploads/1/3/1/0/131069812/25abd8d13a9.pdf
    • http://files.hamiltonpinekennels.com/uploads/1/3/0/8/130874317/9926250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2816/9383/files/29518834040.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/mosenasinazozodafifovuwuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/dwg_to_pc3.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/monsters_of_faerun_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/jopogonivegemimarinevup.pdf
    • https://3f206324-c5fa-42d2-9e28-077f992f55d3.filesusr.com/ugd/e8506d_8eb3046dbdc94042ad0563ca3b79edad.pdf?index=true
    • https://2e0ff139-c420-479d-8aae-10e0e0827f20.filesusr.com/ugd/268ab1_78f93f81cfbb4d58beca116135d05555.pdf?index=true
    • https://8368937d-9ce6-4cdc-bc3c-28fe7cbb7bc6.filesusr.com/ugd/6350c7_8161d50a92284c55893bd9465757b5e9.pdf?index=true
    • https://750e6c45-4a7f-4feb-9a26-edf38a277141.filesusr.com/ugd/8b97dd_051d17d59e3f4ee787e5675f506655eb.pdf?index=true
    • https://7a39536f-95c5-4210-bcef-90b1d495c816.filesusr.com/ugd/6f9b04_4d572ca48b5f490fa608f4462bf5fb78.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/56427141768.pdf
    • https://cdn.shopify.com/s/files/1/0438/8428/2008/files/foolproof_answers_module_18.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/944869004.pdf
    • https://cdn.shopify.com/s/files/1/0434/9614/5062/files/kiroge.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_off00005ef6.bin
3fcea95f7655d60733a9af42a6f02518b735ed1527c001230f97bd6f2ce26775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF6 5668 bytes
font_01_sfnt_off0000721c.bin
785bb5d144aa0559de22fc805c0dde6ca7e4a375002b62566d166e4a19f65b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721C 10276 bytes

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