Malicious PDF — malware analysis report

Static analysis result for SHA-256 2044a5724549045c…

MALICIOUS

PDF

18.6 KB Created: 2020-11-08 03:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a7ea39f135896d0c26eec5956029956e SHA-1: 2e0a7718776b2fb4488684419586088dd039675c SHA-256: 2044a5724549045cc70c5fbd5d19d3d786688c8e6dea72c008c6f0de569d189d
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, 'https://gettraff.ru/aws?keyword=special+friendship+quotes', is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 4

  • 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.
  • 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/aws?keyword=special+friendship+quotes In PDF document text
    • https://saritubix.weebly.com/uploads/1/3/4/5/134507132/366138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fa2e9874bd0d.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/panuzunena.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/8614587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f8e479217b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f8a818da1fe2.pdfIn PDF document text
    • https://konibuxeru.files.wordpress.com/2020/11/13999897400.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://nofagixonuva.files.wordpress.com/2020/11/bevivolexovavowadaz.pdfIn PDF document text
    • https://vumizekajuri.files.wordpress.com/2020/11/82813800905.pdfIn PDF document text
    • https://pugomuzin.files.wordpress.com/2020/11/spirited_away_entire_world_download.pdfIn PDF document text
    • https://gubazagodata.files.wordpress.com/2020/11/mefipalo.pdfIn PDF document text

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