Malicious PDF — malware analysis report

Static analysis result for SHA-256 462a95c4bcb0f1f4…

MALICIOUS

PDF

66.1 KB Created: 2020-11-04 21:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3a3788a0c723bb3df7034e1795170bd8 SHA-1: d788d053a854c2564db7af6f13f13feca464a7d5 SHA-256: 462a95c4bcb0f1f4fb3418cdf9b5c1c9b29308d1f348fafa277577812c2f5189
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://cctraff.ru/strik?keyword=watch+free+new+movie+bad+boys+for+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5f9494c31ff35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5fa037d2f402f.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/mejas_jedepudek_mujukijelig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5f99eb1eb0fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5f9689483d5ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f9e2e631602c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5fa144e23714d.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://s3.amazonaws.com/palikuvexake/torrent_downloads_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/xomurifevinujuzum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e6c6b8-e658-44e6-a8ab-e367b0899887/mezitud.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/explain_the_concept_of_sustainable_development.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/tokyo_ghoul_television_show_main_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc5e3ef-968f-4270-80cc-7460a6171605/erica_cerra_sexy.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/lodoxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430beedf-315d-41a7-8b51-6f5b8d14633e/bozerolokomoxanokalakiwu.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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 5700 bytes
SHA-256: 99b4c6731868802fd6428f10949ebc87241536a23cbb0d3fb581d3ef73f2f361
font_01_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 10932 bytes
SHA-256: d2ba6927d4b1da93cc07d7c1f17f12bc06a8cc9c5ebc9c2c06543b9ecc91b7d1
font_02_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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