Malicious PDF — malware analysis report

Static analysis result for SHA-256 af77f9bc5172e00a…

MALICIOUS

PDF

71.1 KB Created: 2020-11-13 05:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: baad78f76c92bccadf15fac7e0c7ec68 SHA-1: ede56f7cd9c6521bf183946d62db6e35c17c80d8 SHA-256: af77f9bc5172e00af200c23ba520914a2f2e3b3d38543aab0f4a2ae3e98cd562
104 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The presence of a 'download' button lure and ML classification further supports malicious intent. While no scripts were directly extracted, the overall structure and external linking suggest an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=omega+ruby+gba+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5f9e5eca84985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8b79ea8325e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f9c9928bbc92.pdfIn PDF document text
    • https://merasewutid.weebly.com/uploads/1/3/4/3/134348660/tabetanemejapuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fa2453eba7d3.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/5055426.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/a0fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8869268d926.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/4d0e29c7.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/34d79208-8945-4f66-a92b-1dfa34c1c61d/33835934354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c09ac0-9cf9-4f0a-baa0-a962b102d2aa/62719700792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7baaf22-d72a-4733-a7a0-2af4d1b8bb96/77013325677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5ecb92-13f9-490c-aa8d-6756dffbea11/zutezokulokakoxuwuw.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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 5412 bytes
SHA-256: d73ef3dbaad1099f92890fe8c7aaf48afce53a383e0a2d1fc5577e621bc7a8ec
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10812 bytes
SHA-256: af85a001000c6bf1231ca0523d74735012f8052e19669ee52a5ffff6cdd516b1

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