Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dc8657a49f2a0f…

MALICIOUS

PDF

42.7 KB Created: 2020-11-02 10:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 766d967b65061149506b6958fd3d8c64 SHA-1: dcb4e0eda87396371afe4c590d2140122e162960 SHA-256: b6dc8657a49f2a0f9a533ba5c5ad8f9fc10003ceb83921ca86c587d645784c95
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?keyword=joker+dvd+release+date In PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/29b8890a8c242b.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/napemowepub_sarideraled_mebak_vamiw.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/bakoloj/blue_prism_certification_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6cc199-df9c-430d-a9d2-8a6588f3069d/58255867341.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/burger_king_gutscheine_2019_september.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b946c06-c2f5-4ba2-a0ff-0ac052e72806/c_by_discovery_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163e530d-7ca6-4a3a-a201-55117164afa2/idle_hour_swim_club.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/81666202547.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/24832728544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd3c223-854b-4b3b-9d96-84cc72654e86/thermistance_dpart_chauffage_ouvert.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/murirakokinonudaguwaniwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d3436-ecd6-4fa8-86d9-201b135c4d4a/bugubub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557d46f8-0c66-416c-b6fa-c4dc22e6b413/jajaxitiviw.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_off000066db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DB 4932 bytes
SHA-256: 450e0e6a62946379654a09645edaebca7f42a8e230a43ae037db6cc673475fa5
font_01_sfnt_off000077b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77B9 11612 bytes
SHA-256: ae7ffe77eb629c418729510112954b7eac375b25e70a8b38268c674f89c47ae3

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