Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b877f5757fd468a…

MALICIOUS

PDF

44.0 KB Created: 2020-10-27 07:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4fda745178f13ce94861c6276a723476 SHA-1: dcf02f1e101a9fe59a8f88747b38c56c559bee0f SHA-256: 5b877f5757fd468acc7f6db1e45dd59d61df4fec4e55fcba11b70bb46afd0651
154 Risk Score

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://ggtraff.ru/123?keyword=osrs+aberrant+spectres In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/tugaxevedo-gujikasur-numuvo.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/126930.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/xawokogodeduxugowudi.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://cdn.shopify.com/s/files/1/0266/8177/0155/files/norapalev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9002/7703/files/rewibijuxunowugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/fisozeberanezelowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6767/5302/files/pifarisitiwifogaxakidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/11294194918.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/online_editor_combine.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/90191790741.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/654184924.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/47613618403.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/49552741887.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/45810352946.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/formulas_and_functions_in_ms_excel.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_off00006087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6087 4692 bytes
SHA-256: 025eba8936b8244cc6e6cd732102dc34636e09150419a906d7c76bd56e0cbc62
font_01_sfnt_off00007073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7073 10912 bytes
SHA-256: 048de63a782f792a12314087cf752ea76ff7fbbaf757c1f22798e68e62f762a5
font_02_sfnt_off0000956b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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