Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6ef972b4a5150…

MALICIOUS

PDF

57.4 KB Created: 2020-11-18 15:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9beaf38d39f6ab6daa8e12c41c4cd68e SHA-1: 17450d28e8016f9e5801ac11e58690d86e30a532 SHA-256: 31c6ef972b4a51501b9310e21d3a52205d85bc37a95962b3ac3d808290b0c2a9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm. One of the primary URLs points to known malicious redirector infrastructure, and another leads to a PDF that is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/aws?utm_term=hebe+tien+a+little+happiness+piano+sheet In PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/tubuporesiluzab-novavejir-laxapati-lifipagut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_5fb263eb78d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5f9d988f21eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5f9750e4e6213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_5faf3556247e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5f9cfa7971976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f9100d5d07b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5f9f6a4c5e021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fa9c3ed877ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fa0d111576f0.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/34f9e42d-d9a9-4284-a890-9807d864eb20/5324848439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09781365-5bcb-48f1-997c-c1cc3d5c6faa/nikewobabagutisikigov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cbde4a-7d58-4af5-9757-6d71ac11576a/luditatilulopupugopowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2983e9-a3fd-4bef-b46b-1986ed553725/nisuxeniz.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

Related samples 2

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_off0000aa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2E 4912 bytes
SHA-256: c32b3e415391e97da27197c484a1b6ba9c74cf62a3196c49970ffad1c38ba4b9
font_01_sfnt_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 8860 bytes
SHA-256: b2a0e3b86430e599990a3094cad3704df7255055f5dd541d31d04e3b6a81b893

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