Malicious PDF — malware analysis report

Static analysis result for SHA-256 755aa97c49c06b91…

MALICIOUS

PDF

82.2 KB Created: 2020-10-13 03:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4fd84f780c90911d9b5b845c21105d2 SHA-1: fe8cda4153212976534ad08a35e776a0918d5872 SHA-256: 755aa97c49c06b914fd445dcb5126b66b5769c9d275d428a0543324533dbcec1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the primary purpose is to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=anatomie+fonctionnelle+du+corps+humain+pdf In PDF document text
    • http://files.4peggy.com/uploads/1/3/2/6/132695919/gixuxogawonadif_fixexexebev_rikozexozip_pifesetupamar.pdfIn PDF document text
    • http://bavakixi.bblifeinsurance.com/uploads/1/3/0/9/130969858/8797029.pdfIn PDF document text
    • http://files.keeperswesternstore.com/uploads/1/3/0/7/130776573/riduxijuketuraribake.pdfIn PDF document text
    • http://galen.bosfchounds.com/uploads/1/3/1/4/131407005/namozaxisavoju_gupunidu_bipakuvijemat.pdfIn PDF document text
    • http://vuwedib.theclassicknowledge.com/uploads/1/3/1/4/131453915/baduxu-livexiganonus-kafurovo-gukeligarif.pdfIn PDF document text
    • https://site-1043668.mozfiles.com/files/1043668/dikuz.pdfIn PDF document text
    • https://site-1039343.mozfiles.com/files/1039343/37853715977.pdfIn PDF document text
    • https://site-1039436.mozfiles.com/files/1039436/82656089180.pdfIn PDF document text
    • https://site-1040264.mozfiles.com/files/1040264/nibijugenetiputarinig.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/wuliropipajijuv.pdfIn PDF document text
    • https://site-1037922.mozfiles.com/files/1037922/mebajijovivaf.pdfIn PDF document text
    • https://site-1044455.mozfiles.com/files/1044455/76578699151.pdfIn PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/45638097095.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
    • 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5264 bytes
SHA-256: 6853f6cc8706015318d34dabb668c1d127dfef854c5f20db1f06915d2c81f455
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 15024 bytes
SHA-256: 7508ecce7086d1a3bbac3ff7746f9e784b75e3b999783085f63e8544c6f24897
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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