Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1db331c52aecd3…

MALICIOUS

PDF

47.4 KB Created: 2020-10-28 19:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aca23628b7283cf38c4754c1b820ffc3 SHA-1: 49ba75c477dd746a025679f2aeb0c05c74c0c588 SHA-256: 9f1db331c52aecd35b64b23a4092bd0790f4e02911dd04275b547c558ac07ca5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The document body, though heavily obfuscated, contains a URL that likely leads to further malicious content or phishing pages. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to distribute malicious content or engage in SEO poisoning.

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://ggtraff.ru/strik?keyword=othello+final+speech In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f870297930b4.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/divagu-dapuwomisan-ruzoxodupakel-gakukutigodedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f8d5ac1c09de.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/januduge.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/6340397.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/1146717.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/kisesajotikevezi.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/2989992.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/wokasezuwadije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f948a705912e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f8aa2f97379b.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/3486407.pdfIn PDF document text
    • https://zosibikatojufo.weebly.com/uploads/1/3/4/3/134382834/vajafawiboxiv.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/4a3e59131.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/tunurusojuf-perapowenere-vixagodubil.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/9900ae60563.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/6f716dad-1f93-44fb-9d04-4ed5d83ef5f1/73825982690.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFF 5032 bytes
SHA-256: 035ce9d6d2454b51ca77078c37a70af3ac284e5ce8ef34dfd103ba8eb89cc86c
font_01_sfnt_off00008e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1E 10088 bytes
SHA-256: 6aa6095a1f99914d18da7b9dfd628e8ae130d6f8efdb647088c8da10ab2cebc1

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