Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd04504f92ed50d…

MALICIOUS

PDF

50.6 KB Created: 2020-11-01 22:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ad276c595b3c20edea62fc2e6dff34bb SHA-1: 36fb72d77906421447b34f412d3e57af0acadf71 SHA-256: cfd04504f92ed50df696b4b75ece72d3b43979a9570d5334a0bc962e1104c2a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that lead to a redirector, which is part of a link farm designed to distribute malicious content. The primary lure appears to be a fake movie download, indicated by the URL keyword and the document body text. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://gettraff.ru/strik?keyword=download+filmes+2019+torrent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9087eb0a107.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/d585d.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/netisukozuzuvip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5f9702b1d9908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5f9edee0c1223.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/munoremat.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/996ef003-dae2-4fe2-853e-d6cb05a81f1f/fupezobesigetija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7093/9836/files/gomunoxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af39516d-e3cd-4d78-8266-28bd01874ef5/97880672318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3608/2844/files/litululug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c5114a-67da-4fe4-98a4-2037a624a7ab/jolavibaronopu.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_off000082d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D1 5628 bytes
SHA-256: 6af8c2e840691c48889e2aba9eac52ede5ee75208dfddbdcb0c24814df7d6ee0
font_01_sfnt_off000095fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95FC 12992 bytes
SHA-256: 643a35de455bac6a3adb737658f4e7e406a43b534adc98b3388e4b4a9bcf5d51

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