Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd11f2b69359f4…

MALICIOUS

PDF

61.2 KB Created: 2020-10-27 18:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d52948b7d5e662a681c2182b7e9c0f4 SHA-1: 9ffc416d67f20c925753088691c28244aa8e9449 SHA-256: 20cd11f2b69359f4402453687dd0156d9e9c7d415bd90ca7c717ef500f9d5dc0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many pointing to disposable hosting, and one known malicious redirector. The document body, though heavily obfuscated, contains the text 'el segundo middle school bell schedule' and a URL, suggesting a lure to trick users into visiting malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=el+segundo+middle+school+bell+schedule In PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/futevifulukipuva.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/a9d9f2.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/1532081.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/832302.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/4601264.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/nulaxedi.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/dovedawido.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/motugilelil_nuruzakinud_wogifemom.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/deluxe_kobelizogovutag_marixut_boruxofov.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/3503465.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/271eb.pdfIn PDF document text
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/e48fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f8efed22e02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f8d34794ec41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8946c24c1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f87c7a47415d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f894518cbcf9.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/b82cf298-1361-4a89-8f07-62972461e4b8/82250638326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6a4de9-812c-4bdc-96ff-855198f41c58/tewiwozefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3d19a8-e80f-44c3-9c99-8510511073bc/jilaxovidagava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62d4168-b8af-494a-8652-aba29f4c2068/lexuxowegidijazitori.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_off00009ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE7 3168 bytes
SHA-256: 3b9e4e39d06e106a5738284295872198dc4cf53aaeb2fa7eef4affc8e634de98
font_01_sfnt_off0000aa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA22 5144 bytes
SHA-256: 8f34bb2094ec0d2b138a9a060e9cc0ddd32e72c35bba4833e33d87459b010fd3
font_02_sfnt_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 13324 bytes
SHA-256: d3f3a2ca9ab9cafdff54fc00f2e040b622696fde39ab02d08ce500c1debc03a4