Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bb4bc3cd8ce7cf…

MALICIOUS

PDF

41.9 KB Created: 2020-10-27 10:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 10e5e5dc7fe1fc6ad39b08a08547b50b SHA-1: 4803d296d9bde301471676b65dcd2a5369e33c16 SHA-256: 94bb4bc3cd8ce7cfc96c9fcc67fee11c12f0a5fa8d14c8bf5eca84771618c836
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=itools+11.1.3+download'. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing a browser extension or update. This is a common social engineering tactic to facilitate credential theft or malware installation. The presence of numerous links to external PDFs hosted on disposable infrastructure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ggtraff.ru/strik?keyword=itools+11.1.3+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8fc9c6e6fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5f951122a35ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5f97ad1fa9f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f8d5b8cb6711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f974b4fb6ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8daf0b4446c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f90b9680bda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f953578ab503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5f90893f4c27d.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/deluxogopuje.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/karebofif.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/c8731d88213.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/9905666.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/papexewim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajixe/5164834464.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/59367606767.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/staff_performance_appraisal_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/edit_add_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/inorganic_chemistry_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abd4ff9-7b43-4eea-9d21-a0ccdb2675e4/nugowufonoxafaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8303e33a-aeb1-452d-8ca4-852f2b8fe557/recoleccion_dos_resduos_soludos_urb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e0df31-bb6c-4496-87c4-b34d6d628a60/81763145458.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off000066a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 5000 bytes
SHA-256: a545df01e0262764b095a4b52dd911d7d0ed01628d6422f3ae3caf85681d2f42
font_01_sfnt_off000077c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C7 10148 bytes
SHA-256: bad5add22137e50d8b3119693f5e104924bb73229ba1d87370bd03c8d5b631f8

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