Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadded91f53676b4…

MALICIOUS

PDF

50.2 KB Created: 2020-10-08 02:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 98da850c624eb506d249b68b20987c0f SHA-1: c7089416b369deff44c7734da9be7d65d0ae739b SHA-256: eadded91f53676b4993de04977eb32ce772974f0971c2a2144e608192a0304ca
192 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate documents, but many redirect to known malicious infrastructure. The primary malicious URL is `https://cctraff.ru/strik?keyword=free+applicant+tracking+excel+template`, which is likely part of a link farm to distribute malware or conduct phishing. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=free+applicant+tracking+excel+template In PDF document text
    • http://ketajo.adventmoravianbethlehem.org/uploads/1/3/1/4/131407469/2565387.pdfIn PDF document text
    • http://files.pamelaarmstronggallery.com/uploads/1/3/0/8/130814676/pififarosuwav.pdfIn PDF document text
    • http://files.quinnlashon.com/uploads/1/3/1/4/131437513/4054828.pdfIn PDF document text
    • http://tutinuwe.minimountainstudio.com/uploads/1/3/1/4/131452913/negodasekobov_xadoja_xuwura_wukopebuduturov.pdfIn PDF document text
    • http://files.michellebergermd.com/uploads/1/3/0/7/130739699/9368691.pdfIn PDF document text
    • http://files.roberthillpsychologist.com/uploads/1/3/0/9/130969572/jibepibemi.pdfIn PDF document text
    • http://files.arelationshipministry.com/uploads/1/3/1/4/131454986/sobatiginan_memixigisibijo_wuzegujejuw_punuzopezox.pdfIn PDF document text
    • http://files.andysdance.com/uploads/1/3/0/8/130813325/4192473.pdfIn PDF document text
    • http://files.yebonchurchofny.org/uploads/1/3/0/8/130814050/1e90cde36fe87de.pdfIn PDF document text
    • http://libij.hikingtheappalachians.com/uploads/1/3/0/7/130776257/wijibajebu_sipanifixiwega_mofizuwoluz_jozepizamotor.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/govezojefipuga.pdfIn PDF document text
    • https://site-1044104.mozfiles.com/files/1044104/wekutuveferu.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/vubowet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/borderlands_2_castle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8596/3169/files/sample_landlord_letter_to_tenant_for_damages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/zirasazomov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABB 4840 bytes
SHA-256: 73a4735fe486541d74ff2f6e67e3aa302836472940ed636aa04107099c3f8754
font_01_sfnt_off00008b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B12 10076 bytes
SHA-256: 949ed2dd9f72491811cfcddfd66efacbcf154895853eeae97a96638066857f59
font_02_sfnt_off0000ad83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD83 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34