Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdcb269d3b82675…

MALICIOUS

PDF

46.3 KB Created: 2020-11-06 15:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6dc5ec77f337246fe39e788fe71c34f3 SHA-1: 5a99cced6c6bd9ce0834450db346a0fb7cd56bfb SHA-256: 5bdcb269d3b82675d045dc86bf64f090d7d24d94a300a4aa6650a57d58d8c676
184 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. 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?keyword=families+first+child+only+grant+tennessee In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_5fa0f39c07b27.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/896961.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/ce5c60a904164f.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/kamebeful_bukijoxolev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8d64034c986.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/8662377.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/2a64d39c-d0bf-421b-bf71-9e9118d6daa8/wovipuda.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/7392506620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba20c7d2-f3b0-44db-8113-ee09b519a93a/murray_select_ms2560_manual.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_off00006797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6797 5280 bytes
SHA-256: 3435b6d2932f90dee09f2f103c1e9a8f57be6ffb7eaa688bc5eaf2ea2916be32
font_01_sfnt_off00007969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7969 10724 bytes
SHA-256: 5e5366fb26c17855f79699fcfa1a74963c20b347247b666857115bd4da51352e
font_02_sfnt_off00009de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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