Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10da7b3263038f6…

MALICIOUS

PDF

42.9 KB Created: 2020-10-29 11:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f24627553178e2f03c09428e4bfa6dc SHA-1: 9fa341bab97fe0c1d46f1e413091669181d783ff SHA-256: a10da7b3263038f676cd2833488fc57e562e3d95f9a6d385122098061a72cb70
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=essex+witch+trials. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to potentially malicious content.

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=essex+witch+trials In PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/riwiw.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/norupar_kikatop_sonufikuguk_diwas.pdfIn PDF document text
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/wozemimipetagabeve.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/f74a713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8f46f682659.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/pagedomenugoxudujok.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/baruluvoregefexewil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f9687d5a60e4.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/sozawuxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f88fd5c7ef08.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/lutata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f87452f3119f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f88ad91531aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8f2a49005c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8881a18b2c3.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/5750051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f9a68e7cd8f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/videpoditapejozajevid.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/aeromedical_policy_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/92163552322.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_off00006abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABC 5004 bytes
SHA-256: 08f3f55653c178d2e0edf6debd134c68309d9d0be5a673088dd48d2b2a77d1e1
font_01_sfnt_off00007bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 10292 bytes
SHA-256: 282c67c84a4fa6959bf4102813d2864a5acd6e6b6660ca65038c214f52af9c18

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