Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e5b89ba2bdf7d3…

MALICIOUS

PDF

38.1 KB Created: 2020-09-18 08:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46555133d9faab46d0299d34e2762886 SHA-1: 68e6b0afe15c89efb58ee33d2d60e700a86b70c3 SHA-256: 93e5b89ba2bdf7d3983c9efe8cbd376d4132a9851f485792dc9d758bf31ee75f
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily corrupted, contains a URL that matches the redirector heuristic, indicating an attempt to lure victims to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=codominance+worksheet+answers+cattle In PDF document text
    • http://nubari.themcbdd.com/uploads/1/3/2/6/132683071/kivutov.pdfIn PDF document text
    • http://kidanew.kangaroossoccer.com/uploads/1/3/1/1/131163635/8f1db758.pdfIn PDF document text
    • http://files.temploobaife.com/uploads/1/3/1/8/131856919/fetuwi-ritub-dojokipenituwux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/91505647639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/bibliography_format_for_encyclopedia_articles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/bodyboss_method_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/nescafe_dolce_gusto_lumio_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4174/1205/files/rugadipujobu.pdfIn PDF document text
    • https://7cf66542-398d-4892-8469-79a22d35a1ec.filesusr.com/ugd/3eed2b_aa093a55968d483aaf2c3d8e5b92d545.pdf?index=trueIn PDF document text
    • https://8a30bc82-0d87-4dfd-9bb8-41f6fc286e23.filesusr.com/ugd/1a89c8_e8e70d42e0a245819d6b62a503a457c1.pdf?index=trueIn PDF document text
    • https://e6045368-e4cf-489c-a01e-2dd852108941.filesusr.com/ugd/23a6c3_498a25eaeb184e5d87690195dc96cf09.pdf?index=trueIn PDF document text
    • https://bd0fbd8f-52b6-4fa4-94ad-f031bbc8ccf8.filesusr.com/ugd/df7b34_fbd54dba7f3c4e09b9970bfc6bf9f6e4.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000584a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x584A 5240 bytes
SHA-256: 4a09c869bc13a74ff8de6dbf4002a652a522d5e3040bd4e1d55ac4dddf57a256
font_01_sfnt_off000069f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F8 9944 bytes
SHA-256: d6659add840d6ea7a8880c3e7c9dc21925a6432a5a3885342ae2d0b88783cdfd

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