Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b044c062e396943…

MALICIOUS

PDF

46.4 KB Created: 2020-10-26 05:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 81e4b200cb9d5f674a427ccd60d6d53d SHA-1: 423a63a73470c968a5d9cf2a448a7228010502d9 SHA-256: 8b044c062e396943b7a5ea795df3a7415f6facc00d5fec3ec7d49468f200cfa1
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=concept+of+economic+value+added+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f914d9b1b40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f89179912be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8714d545cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f963755d522a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f90cdf792ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5f91e1aa29125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5f96168d9a9b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f9036081de6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f8fb862162ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5f93e0d1086e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5f952037b3e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f8d9eac7d8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f93abeca915a.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/mijedusovineti/39358449006.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/ages_and_stages_social_emotional_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/antiferromagnetic_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/abordagem_da_pesquisa.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/aisi_8620_material_properties.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/jalur_metabolisme_protein.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_off000078b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 4992 bytes
SHA-256: a0f7e1eceb0f1db995f59de3c5f9019f4de03495b6805f4b76e21c2ec9cf6b7d
font_01_sfnt_off000089a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A5 10140 bytes
SHA-256: f1fc6df2af58f6333f85f245bdea6ccc3f4ae023185f72358f4dc637c811805d

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