Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc66a49be9198c9…

MALICIOUS

PDF

62.6 KB Created: 2020-11-11 19:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db24cadacbc3db1087681ef063b42111 SHA-1: ec5981e50eee9a01a427d81b8e9b426c7f860963 SHA-256: 1fc66a49be9198c9a64fccc57865d9b14fd232a0dfa3a82890ede8e8fca4e365
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ggtraff.ru/strik. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=ejercicios+acotacion+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fa89ceda073a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_5f9f6c8dbe13a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f87077d50289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f8b13f14741a.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/adae0da4-890f-47aa-8523-1c925a19d47d/98966731521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a893ff-75af-4e0b-9dfa-1bb747df081e/fepujubuzadujuze.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/nunafuporutenodexuvaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/cold_war_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/pixafapavejelamokiloxupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a54d66d-1071-429a-8d15-0efff80e94be/91252772970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33f66f1-74e9-4177-bfca-eeb8093eafb0/fenidetodifibuzadixisom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394d3bb8-7d3d-4f7f-9627-ce61c64e4eed/98130792972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7ac0e6-a9b1-4415-ac4b-88da085d3c39/libiladobijuruvulo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/niped.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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 5152 bytes
SHA-256: 60c8ad03c06f17d9d56ab341a1e9be28cb4b7307a4456db42cc1bb6e0a817dea
font_01_sfnt_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 11872 bytes
SHA-256: c46d196d123cbb4c0de70ca9f1fc2d162637bc4be34bc038f32936bc3e784fa1

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