Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8455b9d90ba267…

MALICIOUS

PDF

45.4 KB Created: 2020-11-06 11:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ca17d609706dd6e7a9fee1516349c62 SHA-1: b1ec72596bb59c34c9cd2ceeca0cf55b0f131bd5 SHA-256: 9c8455b9d90ba26791084d0d74b1cbe04e9f66c64e0d5dd16b666db48bf6cbac
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is a high-confidence indicator of malicious intent, likely for phishing or malware distribution.

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://cctraff.ru/wb?keyword=radian%20and%20degree%20measure%20worksheet In PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/b203f5f.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/2898707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/478f0d3a-0d08-469d-9b06-9ca9512fc985/zatibeba.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/change_recovery_email_on_google_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7175e6f7-b9ed-4a02-950e-a6ab5ce3a09a/destilacin_por_arrastre_de_vapor.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/mekamugalonijasozemuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81aafcca-773b-4ca5-81c7-3590ddf31cef/jawesakuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/gadutefomol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230e52fd-b6c6-417b-ad1f-e85a64ed8afb/ecosystem_study_guide_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/97786978422.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/33743536501.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 5252 bytes
SHA-256: a82054c254e529281f55b1a9e9edea68f6556ba67d36392383727a477dfe29cf
font_01_sfnt_off0000759f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 10844 bytes
SHA-256: d763fc0dc72b5b15b971e5d9d5914a988fa4cee9c6fb120265c79b3e34997978
font_02_sfnt_off00009a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A89 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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