Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdde8007e642ab5…

MALICIOUS

PDF

41.3 KB Created: 2020-10-21 04:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 51c142145b8e1638d61d03e3e9beafca SHA-1: b553971f6629d5d5f38b0e7039bfb237e8268e43 SHA-256: 5cdde8007e642ab5be00a4c1f3df9d50e57256a71b073508ffa36a78c93631bf
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, ggtraff.ru, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded link is sufficient evidence 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://ggtraff.ru/strik?keyword=guia+santillana+2+grado+primaria+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f8b85af0f34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f8aac60472f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8d5cfb6c818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8873dd490fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f8ee66bb4c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f8f5815ef0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f88065ac61b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f8f1310570ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f882002e2ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f875d87b9d44.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/sugaguxagu/business_plan_samples_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/98071871331.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/cambridge_igcse_maths_student_book_chris_pearce.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/90866048766.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/sanamifepudujeju.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/tedozizapudogibuvodepowi.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/genalipijediranunivoradin.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/tegurekividewito.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/novoxafejivugezatov.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/basin_street_blues_trumpet.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/data_mining_tutorialspoint.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_off00005f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 5524 bytes
SHA-256: b70d4c1f741c0c705f4d172d545cc362629914df826426fc69eb459ad69cee97
font_01_sfnt_off000071f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 11140 bytes
SHA-256: 81c341e995914192609848aef738abbf8637e2f61ba69a20833c2cf689e45db8

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