Malicious PDF — malware analysis report

Static analysis result for SHA-256 343ca72aaf9189ae…

MALICIOUS

PDF

77.9 KB Created: 2021-03-26 08:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eae121b1025fb7ad9d951b3929f3dc14 SHA-1: 28f32967152a644b5b8b45f69295d6ceb4e42be2 SHA-256: 343ca72aaf9189ae37a54bf3b10b98c6d7e38afb18665d01e9254bc4ed884dde
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of external PDF documents, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=treerazer+pathfinder+2e In PDF document text
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/20cf5dadcf42ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_601712b2657a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367289/normal_5fec2f6ed73a8.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/punukavotatit.pdfIn PDF document text
    • https://sarefijinarexaw.weebly.com/uploads/1/3/4/8/134862577/2491119092c28.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/kekalinuwakineza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_604f0afdd9dcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ff71afeed7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd63361bbff7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce83418e-64b0-45ce-86cc-375b0fc1159f/how_to_record_sale_of_fixed_asset_in_quickbooks_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5989deab-5802-4c60-bb64-67df8e6b2149/32702259443.pdfIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_a79a7bd6bf2f442c83b9a9a453409941.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c918b90-d85c-48eb-8f55-76fe0b7dad32/numakapuno.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_236fb4e5c638452aa2d3df753fd716fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/porque_no_se_puede_eliminar_una_conversacion_de_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ce85ef-be36-4438-a067-505c09f3d991/48219142508.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/waxowamopidisip.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_db76c6c3c7354d38be7432eea793780e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/personal_statement_for_scholarship_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/how_can_you_tell_if_someone_is_infj.pdfIn 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 5052 bytes
SHA-256: d0933cd85acee4766240f1df1c092d22439c9b3a06ecbbddc34cb6c4e2d5cb9d
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10840 bytes
SHA-256: 96ca957b5e2fc4df492554aaf07f8c9c91b40d401300f7cba3279c680895bf28