Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b1b50159815d27…

MALICIOUS

PDF

70.1 KB Created: 2020-12-28 12:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9f297431e5fd15e5305ba2d6b305bb9d SHA-1: 0a4e41dbc7b67f3b159d1c6026e2a3eb332ad7e1 SHA-256: d9b1b50159815d277d31fc1a1a16ca376135bfefb572e940c6eb364743307cad
214 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a hack tool. The PDF also contains a large number of links to other PDFs, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=simcity+buildit+hack+tool+without+human+verification In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fd6d7e3bc204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f99cb7c8b691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fe0757351841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_5fda0ed4061d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fdc3a617d3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f59f28dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5fc211f9bc5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fa849ae1bc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_5fb2f21fd2248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fe3e0a461297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_5fb50f9dea8c9.pdfIn PDF document text
    • https://zixozuji.weebly.com/uploads/1/3/1/4/131454221/8769033.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/52b939ed-0125-40b0-a720-9e4e848174e1/velobe.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_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 5644 bytes
SHA-256: 0a7d646ab08123117e2177aaab8821e082326be2e9e1cc746c16dcd53d0c20d4
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 11608 bytes
SHA-256: 0d537d68d21338daee7b2fc3bff8da22352c7de4ae2fa3fb6f1c2ce9bc3fcc57

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