Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef913bf695add51…

MALICIOUS

PDF

69.0 KB Created: 2020-10-26 08:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e123688c866d90ceafe5ff98000363f SHA-1: 9087791415ffb070e7f513a881b0fa448f6354bd SHA-256: 5ef913bf695add511a394c9a4327fd6ed1a2c7203f5c8a866b974cf944e437ca
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 0.9986

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://ttraff.ru/123?keyword=desktop+fullscreen+web+browser+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f95fd0d680cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8a8fd668251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f87068315723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f8f250a1281c.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/puxajafuw-medavonigez.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/faluji.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/fafaw-janurufisakoben-galupi.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/8918704.pdfIn PDF document text
    • https://rojigoziziza.weebly.com/uploads/1/3/4/4/134434225/boginesefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f90c40fdb1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8f906e4cda0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f918ed8ce9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8898f75875d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8835fe1cc24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f88affc0144a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8bda704fabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f90d8d7e22bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f94ba7e3093a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f8f606d12227.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/c08625c0-4f58-4f91-884e-5bee223665d2/51031331338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdb64be-6883-4de3-a9dc-b74373635dcc/40706319271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925cc308-bd34-4854-9eb6-5806a3d9b6ab/wojifumejufabemunixawub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d6b642-8314-492e-84c7-d7ce7a7b96d5/novuxejepovufiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dd5a06-13ac-4885-a5c9-83edf883bf8d/zubujimelik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4581de-e634-41f5-a28d-548a88f3de39/70988465746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804ff68c-7069-4e8d-9ac0-f242206e693f/71038843589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3070fd-d4d1-4db3-bced-7db3dec93884/miruwizoputosobeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4494be5-c288-4c1a-b939-2d397a2d7fd8/1341543328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9016dcc6-b05c-4d64-8356-8d85ed2f080f/lowofu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000c87b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC87B 26852 bytes
SHA-256: a71885afc6d977a48ff4b87f72a61b9ae77de4aa29e42d6e30b259fb85c1ba77
font_00_sfnt_off00006f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 10732 bytes
SHA-256: bbbc001e9cb0563c8e680f8510386f0f4879f3add10791f5905a19a7ea5fb3cc
font_01_sfnt_off00009294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9294 5276 bytes
SHA-256: c042e9281492b53eef9dd0fe276242ec7c5036ade4636da2d9c649fa1d48cd87
font_02_sfnt_off0000a4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A8 10708 bytes
SHA-256: 5ee98dce8b8ed6edb74b2e8719573b9df333b0d64f33015b33c8b018459bac3c
font_04_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378