Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1def56c9808b9b…

MALICIOUS

PDF

133.8 KB Created: 2020-11-04 11:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0fd9397ee447785486d8066b7dec3ea SHA-1: 1ff3e2170a5b89e5f088659ded24bb746eab054f SHA-256: db1def56c9808b9bdd3a1b06b5f261dffe73b0548d9fdfbd5a92ad662ba99d18
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL which is likely intended to deceive the user into clicking it. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ttraff.com/123?keyword=quotes+from+the+twilight+zone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5f96b5e783ddb.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/1b0370078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8d4d3f35a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8da57685292.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/pibabopuduj/rexx_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/19596006247.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/csc_-_lawyers_incorporating_service_company.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/80918176121.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/wonefowewevulibun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487e4ebb-2c61-4e33-9a56-324a7dba82e8/fugovuxesidowatozisufez.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_off0001d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D487 5172 bytes
SHA-256: fc20691b617ad6e297a2dbec063c4a3c5b4631f246f9a1bc28f2433c8178872d
font_01_sfnt_off0001e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E61A 10784 bytes
SHA-256: c74d6048a5c495f117636e0cd036ca002fa9c0d7cc36d1abf40e9195eddc3918

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