Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd1714fc6c5d0eb…

MALICIOUS

PDF

76.8 KB Created: 2020-11-26 04:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 306b9012eec107cc938683df4ebd7118 SHA-1: 9cc36fca3cc3e66d3c79f6bb016e474b62e90c13 SHA-256: 4dd1714fc6c5d0eb0ea13eefb9167167433038dfa0ebfaef31706471cd1c1a2c
134 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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=skyrim+change+appearance+mod+ps4 PDF link annotation
    • https://nulazonale.weebly.com/uploads/1/3/4/8/134892754/6126947.pdfIn PDF document text
    • https://sowofinonapira.weebly.com/uploads/1/3/4/3/134361296/4402572.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/49c8f69b631a820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5fb52064aa1b3.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/rubemawowegu.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/3403789.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/karogududuv.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/xuxifuzituwu/classroom_management_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb284032-4253-40ac-ad23-4229757b07f8/mibug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7a8e76-5d54-4e69-be6f-506f5c0934fd/4384800943.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5812 bytes
SHA-256: 3cc2713033b23d7eba365de6202da756e74dae13d8cd2f4576bdeec6292f5b1b
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 10928 bytes
SHA-256: 6bfada9a3ecc5e386a53263ca1220aa4af738b5ebb6efe728c66487c66b73bac

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