Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37742e8646f421b…

MALICIOUS

PDF

41.7 KB Created: 2020-10-03 02:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 168cc92ac88d71571a00f21ed266c277 SHA-1: a5a2a129f0699a975f1229ca06c380e45b6a0034 SHA-256: a37742e8646f421b52701b3a4efe282c11da234a9dfb60ff515f0596e62b70e6
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed for keyword-based redirection. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. The embedded URLs are the primary indicators of malicious activity.

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 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=inteligencia+emocional+libro+pdf+descargar In PDF document text
    • https://site-1039187.mozfiles.com/files/1039187/67709457139.pdfIn PDF document text
    • https://site-1040663.mozfiles.com/files/1040663/71437426842.pdfIn PDF document text
    • https://site-1038363.mozfiles.com/files/1038363/bipekukaloxuxazid.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/bewudezim.pdfIn PDF document text
    • https://site-1040264.mozfiles.com/files/1040264/mutubumarumekeravitani.pdfIn PDF document text
    • https://site-1038857.mozfiles.com/files/1038857/fupaxowepetaxuvopi.pdfIn PDF document text
    • https://site-1038693.mozfiles.com/files/1038693/xizegikutewa.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/95902743672.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/gekudapokovekepuf.pdfIn PDF document text
    • http://files.cheriehrlich.com/uploads/1/3/1/4/131437091/mupam_pebejakuvi_giwukibelomope.pdfIn PDF document text
    • http://vuzuboseg.redsquirrelconservation.ca/uploads/1/3/0/7/130776046/nopizesinim_gizisixenaf_lepamurifike.pdfIn PDF document text
    • http://karis.techlitecorp.com/uploads/1/3/1/3/131383609/1212759.pdfIn PDF document text
    • http://files.bebeyeend.com/uploads/1/3/0/8/130813948/6506352.pdfIn PDF document text
    • http://files.fbcbluffton.com/uploads/1/3/0/7/130774969/9543407.pdfIn PDF document text
    • https://site-1040298.mozfiles.com/files/1040298/wexav.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/mekepixivilevikupad.pdfIn PDF document text
    • https://site-1038856.mozfiles.com/files/1038856/vebevinotuviwetadubune.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/31355920827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 5552 bytes
SHA-256: fc843cf5594bd4ac7047a137a661ea6b63b085d41b58cb88a700c20aa0d2bdd1
font_01_sfnt_off00007357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 11216 bytes
SHA-256: c2b9c9e6723f6edb823c139c3f1a29330895b452d5033b101f57dd8815963591

Open this report in the interactive analyzer, or submit your own file for analysis.