Malicious PDF — malware analysis report

Static analysis result for SHA-256 903c4a8a6ff9484f…

MALICIOUS

PDF

39.9 KB Created: 2020-11-04 08:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bee19df62f006c79c8bd553eea0ad30d SHA-1: 50b2c0f71728db755618cee7d0a66cd62146a645 SHA-256: 903c4a8a6ff9484f1acdd9fec0007a95a097c854ff53ff9c14e7e477ce9a6d70
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised with text suggesting it contains exam answers. The ML classifier also flagged this PDF with high confidence. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or malware download.

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.me/123?keyword=excel+module+3+sam+exam+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8f46041f1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f9fcda3b73b3.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/nejafuwuk_timikaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5f9b192cd79cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f892ffb25d0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fa10ea64efba.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/kovugokugamuzep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f9b9e05b2658.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/kokesatodixon/zagamek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2128401c-dd15-4e39-a4b8-414f6e88f920/4_7_8_breathing_exercise_for_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0346fd-a21a-4a6d-a0a2-44e58735bf8d/76935268541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36516789-fbe2-40f0-b2fd-be006cb62510/goodyear_assurance_cs_fuel_max_225_65r17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b696987-1585-4a06-abda-ae254a83a019/felder_balance_de_materia.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/2717231719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd8c1a8-e8d8-452d-9500-ae4c3339dcc4/zalifudadegu.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_off00005cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFD 5368 bytes
SHA-256: b9f95d22d327a728600cc24f6d6091f6539ead8df108690864cc80e89ca90f1d
font_01_sfnt_off00006f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 10356 bytes
SHA-256: 3087fa2a03cdc86ab2af9d779d7d2891ae62f5f36f9b62af47f6007b826d725f

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