Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e7e1b352ba077e…

MALICIOUS

PDF

74.4 KB Created: 2020-10-29 08:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: af1bcc5bda662de01c88198c1d7c4bfc SHA-1: d627de96e2e603c1b7943a0b13b0dadee256525a SHA-256: 41e7e1b352ba077ea1c67125a7af256feec75fd4184dfb93fca9de054d4c3765
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 0.9997

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://gettraff.ru/123?keyword=consejos+escolares+de+participacion+social+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f8eef280c742.pdfIn PDF document text
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/pewozabisi-lajapiw-sevonis-vizererim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f881eafdf4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f9388b96da16.pdfIn PDF document text
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/1162095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f93a9fd85ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f92c676d9002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f974932173ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f967250a43cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f8eee5c238de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f88608c07110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5f92df14231be.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/0836f2c35d91f.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/af8a746eb10411.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/fizaxo/tipos_de_cateterismo_vesical.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/unit_11_psychological_perspectives.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/18994031008.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/vizulijeluxudagafenepi.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/tadunakugezowegogagexux.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/school_billing_system_thesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc8053e-d836-40b4-80ef-62c5435c4c8e/36766902655.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/76930054677.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/vasavaxevijituzara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40db492-a837-4317-a721-bed9b4953432/7393991702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66eea60-a8cf-4616-85f7-0603f6b676de/zawodopeverak.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA708 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000b750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 8384 bytes
SHA-256: 769cefdf176b7862847f2404e20892bc251dd838ad5f003b7a60c267c691a22d
font_02_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 5528 bytes
SHA-256: bd86ba86879d4c4280689ee7ce63e12a1072bf269ca4414abfb2bf93140293f1
font_03_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_04_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 12980 bytes
SHA-256: 8ee9b6bec6c8b7dcf85358b7b4a6dd4f459dd1021a3a7a08fd302c8bfe048341