Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421de2809ead498…

MALICIOUS

PDF

41.9 KB Created: 2020-11-02 06:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 00ad2c92e39af690b6729ab39abd279c SHA-1: b95b3f038c66e3540ab37be0b35ff3dda3fe449d SHA-256: d421de2809ead498ecd24cb11a91a010fed8c71f03a3e0d9ca8e0818e3684d2b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.ru/123?keyword=drive+james+sallis+pdf In PDF document text
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/gevox.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/8900c103-595b-4518-aa50-6f9eb15e78c0/58434672737.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/zutetojitajofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa5a177-3d36-4122-bbce-43de84a9af14/5701132216.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/dalovaravugoxirabab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3b3697-2e9a-4e5f-bb9c-d6a9914da4ed/el_zar_y_la_camisa.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bibliografia_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/rumuxufosotakuxede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3673864a-18ba-400f-8ad7-87349e8c9051/basozojomunipibe.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pdf_para_aprender_ingles_descargar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/67553917548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd7c74d-a4e8-445d-88cf-4ed3e0f30282/descargar_internet_download_manager_para_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d5fccc-013a-4c2d-9146-96f8cc0675ac/vibalujogiwokavorumenuja.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_off000060b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 5324 bytes
SHA-256: a537477ec4f604e20191225f9450116bc72d1d00043aa33170940cd1aa4dcc15
font_01_sfnt_off000072ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CE 12144 bytes
SHA-256: 1cd4a7384db144208d9da5110a92717e3619ad4b6b966cd8c0f208955212dac6

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