Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbccbf3453dcac42…

MALICIOUS

PDF

151.8 KB Created: 2021-01-16 14:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 064c6b19a403cf7326c952cf3881f624 SHA-1: a2a6a59d29bae41465f5ad4b4acd55e9d66a3bab SHA-256: cbccbf3453dcac426fe8c279b249b8ce1851600f6dc1eba3db9e0f677efbfb95
132 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at `https://traffine.ru/wb?keyword=castle%20miner%20z%202018`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, and the presence of numerous links on disposable hosting indicates a link farm designed to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/wb?keyword=castle%20miner%20z%202018 In PDF document text
    • https://site-1172684.mozfiles.com/files/1172684/anforme_economics_revision_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fc935320024e.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/wekav.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/8ea78e6.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/4654232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5ff313db55495.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/sovoxunarobejanu.pdfIn PDF document text
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/darorulajoxud_dedotewak.pdfIn PDF document text
    • https://bigabupagekul.weebly.com/uploads/1/3/4/6/134667232/135ead5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5f93a03a5ba78.pdfIn PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/kaguramuxesiresomudimer.pdfIn PDF document text
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/342ef3b91b5.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/henghuili-files/nsfas_online_application_form_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ADF 3904 bytes
SHA-256: 28e9ab3fa9b3efe8230055b198e8f979fc422d7a48035d447ff71ffe94f3930b
font_01_sfnt_off000218b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218B1 5304 bytes
SHA-256: 3a3dc56df5e0edd10238093a2d6434ec9c6a5fb1ead91c7ba389e617965115be
font_02_sfnt_off00022aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AA1 11900 bytes
SHA-256: 5c8b76a4024491c49539fa7dcd34c31ffa484dd55df1510deec62d6d0b5c93eb

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