Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4c27bdfd811ec6…

MALICIOUS

PDF

43.1 KB Created: 2020-11-05 08:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1c3902fd9c9f80c1f24f478fdab9bb7 SHA-1: 92038f7e25f29e87d13d9ee4712cccd0569e843a SHA-256: ea4c27bdfd811ec6ef12724bb6ec562da225be0d1dd35751df481468885d733b
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file 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 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.cc/123?keyword=difference+quotient+worksheet+precalculus In PDF document text
    • https://gizarokidobibaw.weebly.com/uploads/1/3/4/3/134363860/9588322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fa2ddc0a5e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f8e366d7319c.pdfIn PDF document text
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/3b5f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8d2928e6d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fa04c95791b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5f93cf635ecf1.pdfIn PDF document text
    • https://jususisizeka.weebly.com/uploads/1/3/4/2/134266965/90d3ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f9ca9b73e8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f88d8b22188d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ratekol.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/6c987b8d-6cd0-4252-9a4f-910375b624ea/the_way_of_shadows_graphic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f837681-0c7a-4372-a83c-2f33a973bd7f/naruto_naiteki_kensei_r2_download_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62cae05-b196-439e-a6a3-3d5b7b578e66/vikitisigexono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b32ced5-bd45-4651-b389-9aa398525287/replication_transcription_translation_review_answer_key.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5481 5384 bytes
SHA-256: d41f8a6be9f822229462fc7a76800c63d8cbf90d9b215bb6e7a66fad2574d33f
font_01_sfnt_off000066ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 9980 bytes
SHA-256: 82ca94b229fc91750ff733a84dc0caab775824bc6ac31607879623d277d6298c
font_02_sfnt_off0000897a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 16196 bytes
SHA-256: 511e8fca7d5650a1553df0ab96bc071f6494edab69b9463fd202cd322967e1bf

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