Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43bca5ba9cd7e70…

MALICIOUS

PDF

51.4 KB Created: 2020-11-08 16:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5448991ebf4334ecd51cb6736b141433 SHA-1: 75a9c4a1091ada6f91fc395da02efd59c42d57a0 SHA-256: d43bca5ba9cd7e703413722e38c68b9e99849f6ad60f7bf251e65e57279960da
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text related to medical conditions and the authoring application, suggesting a lure for SEO poisoning or phishing. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination.

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/123?keyword=posterior+fossa+chiari+malformation In PDF document text
    • https://nirotobilimob.weebly.com/uploads/1/3/4/4/134484477/pawisurubagev-rokuwezop-nejadivop-diledadotenu.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/xabigevabagowo-xexokazetiru-nowanibol-nulivojagaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gopigabipur.files.wordpress.com/2020/11/accordion_sheet_music_thats_amore.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fgo_jp_apk.pdfIn PDF document text
    • https://sojurumopo.files.wordpress.com/2020/11/kibopapad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a379c99c-7a9c-4190-b5d8-8cbfba3b2270/56791030742.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/swimming_suits_hot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff266852-4fc8-47e7-8bda-ee9d1cd05ee3/boturufasofexuwegi.pdfIn PDF document text
    • https://zujuvigewif.files.wordpress.com/2020/11/sociedad_en_nombre_colectivo_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37da79be-e59c-4c91-bc70-08b14a48d86b/mizosexuvokumora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f0c1b0-5ece-421e-9b5e-ebc97b87cb23/forensic_entomology_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/26847903455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca673c7-f37d-4d63-b70c-4af9a7956f27/zogifomiwuzoloje.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_off00008b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2E 5124 bytes
SHA-256: bd8224a326f226058cd326e639b1f8980819666c3369b1c850b51b3f8cc71f7e
font_01_sfnt_off00009c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C70 10536 bytes
SHA-256: 27188ed37497a4556308c6018e169db2f967a0b2a6e3feb9bfedb988467c99ca

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