Malicious PDF — malware analysis report

Static analysis result for SHA-256 4807e2b988623220…

MALICIOUS

PDF

45.3 KB Created: 2020-10-01 12:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f110189626edc34d87b666684c4b1a51 SHA-1: 7df636f01ea863a114b78f91e6cc99327a76102d SHA-256: 4807e2b988623220f5f92cc892e4069398cc99b1d91066cb70303d8ad39468fd
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure and disposable hosting, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

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://gettraff.ru/strik?keyword=biocenosis+concepto+pdf In PDF document text
    • http://files.14thandmainchurchofchrist.com/uploads/1/3/1/1/131164310/gatovikido-pegetimudenazit-ximefefuwipe.pdfIn PDF document text
    • http://files.nvhstheatre.com/uploads/1/3/0/7/130740213/9982865.pdfIn PDF document text
    • http://files.whereisyourangel.com/uploads/1/3/1/3/131379680/dejif.pdfIn PDF document text
    • http://files.olimedics.com/uploads/1/3/1/3/131379394/710959.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/wolekenerapidujibimafem.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/26248249501.pdfIn PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/41762713419.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/7588b2df-2fa5-472a-a25b-e31699830da7/mufaloretakisel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2db50c9-e016-4399-9cb9-8295a719f2d9/82625321984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0c5156-dfbd-4c5d-ad46-b55043d556e8/9641144220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93dc665f-ceb2-4184-b5c1-b014a2c3845d/gunixodolomewaruri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8c8b49-9116-49f4-a6e3-58a04efc5ec9/27429268745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a2e082-e439-4385-b556-047611a5254f/sumisorunovewinuxine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9a4ab9-0ab1-4811-96d5-25d3ec101c0a/buzujipunukezigifipugegub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2122eb5e-24e6-46ec-8bb3-362a6455f7a3/dasazafafax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe8e767-f2aa-4c27-9863-97d756d5e050/pazugub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a146a196-8537-4263-9412-56fb1cb17185/32388303330.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_off0000759f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 4860 bytes
SHA-256: 144605bdc3e776cbd663aa7c39568a490200cee394ed447f05419e3a5fd87cef
font_01_sfnt_off00008648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8648 10040 bytes
SHA-256: b80ee7b72b0cc3696809c18a309dc590b4b0e9a9f7ef94288a590b6c3234d0a0