Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9d8b5dc7ebc53f…

MALICIOUS

PDF

42.7 KB Created: 2020-10-30 16:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 96b2ddcc74feb603ea5c69e7ae38c0b7 SHA-1: b642a7f321f308979f6374f743db6389069149fe SHA-256: 1b9d8b5dc7ebc53f42aab7193e448c0179c0a8526bdb1598cc9f85ffa8219459
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The document body and heuristics indicate a lure to external websites, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector pattern.

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://ggtraff.ru/wb?keyword=html%20link%20to%20pdf%20document In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f8aeb71e4782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f99124712db4.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/8b5f48a74.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/4acdd603355274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f96809b13701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f917ef60368f.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/sezebepit/gebazogajor.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/architecture_student_design_portfolio.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/catecismo_mayor_de_westminster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44580010-2162-4363-a3ba-477496ffb2b4/33646737153.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/19437902337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9979a55c-43e6-4224-9014-d5749b78d80a/32394750303.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_off00006900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6900 4840 bytes
SHA-256: b20fb06ff72821c0996bc4d2bd37c0ca8af569a0ac53dd08d3e41ec2d65868cf
font_01_sfnt_off0000796b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796B 10780 bytes
SHA-256: 2dc25d2d4ae6f05054cab7076501fb6cd544de58d743d975796b42e1fdfb00a9

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