Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43466ef175b6805…

MALICIOUS

PDF

65.8 KB Created: 2020-12-25 20:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f931e5afdf02f1a19d5cb2ff420ec78e SHA-1: 798f041c1c63c6e93d477af74dbbac85594e94b7 SHA-256: c43466ef175b6805b7bf84dc9d18b926dd9d48e3f04e69e876e42a9207828975
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of links to external PDFs hosted on various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The primary redirector URL identified is https://gettraff.ru/strik, which is known to lead to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=modern+history+book+for+upsc+spectrum In PDF document text
    • https://cdn.sqhk.co/jasowipe/j1hjXJa/41077692322.pdfIn PDF document text
    • https://sugibovipebu.weebly.com/uploads/1/3/4/7/134705953/8175870.pdfIn PDF document text
    • https://bovexojegej.weebly.com/uploads/1/3/4/4/134481742/megojejen_rapolaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_5fbec9acd6bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5fdc3c01ea8f8.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/tjhhjhh/ryan_s_world_bubble_shooter_games.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/ruwijisif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fdb35d9a419e.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/2674488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451563/normal_5fddd0f933e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fab7bd1396a6.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/vetevadifadegum_koveg.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 5464 bytes
SHA-256: 248a66cb72b104d8225170b790ab39edacce5ec4aedca194e5c678f7a6d6cba7
font_01_sfnt_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 10304 bytes
SHA-256: 2343a921c5198eaf361a3d3aa26cd7ed16a082e7c0279f1ceb28f480acfd6f1b

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