Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea40cf96f8b902e…

MALICIOUS

PDF

46.1 KB Created: 2020-10-15 20:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 141e1852ac3ef9c77e63f63cbaa4b2e5 SHA-1: 54618f712bb33ac41e10a3f7e58e3bf04597fa0c SHA-256: 8ea40cf96f8b902e2bd6151d74a7ea9a0f4f983e46bea63feb4d6b1e67293d06
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, indicating a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/123?keyword=division+word+problems+grade+3+worksheets In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dupuvikadijuraxere.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/50af8fd7b75.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/vurikuwabufaz.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/1286863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f87398f30170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f8749a01d4d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8744575a5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f8717092c5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f87689e08e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f87ab1ae29f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f88468f4157a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f87ad21605f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f875a5f4710d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/9584886.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/c27324b56d05f.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/kurutiv.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da412d2a-4fd6-4607-a295-c9399f697379/solud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed39a1c9-f33e-4d40-996c-55137e12d49b/ruxivewanena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a20583-32a1-4ca3-826e-15236cef0cc9/1600071592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb6a0e0-0fb0-4659-a453-29b93e8f4b74/7520506747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2af3d3-d80c-4b5c-93ab-182f3a7ecbd0/zujewogevejejinuronuvureb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc349ee5-8903-4eb4-904f-fd080ab478d4/refojabarikagekazusanon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00498e2-fe79-407c-856b-078bb9dc84dc/35275294895.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_off000072ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 5892 bytes
SHA-256: 104278455969a141aa356057c0c55c7f6ea0287cbdb66eafcfa4a50d10775ba6
font_01_sfnt_off000086f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F8 10628 bytes
SHA-256: f58a33570ffe599bf101be3a57e61460b2a615ddd15a3f8280c672c7985ac9a6