Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cfa8df8f98d2fd…

MALICIOUS

PDF

69.8 KB Created: 2020-12-10 13:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c054236685c8e44d020d843952318359 SHA-1: 24aeafe65bfcf3385e332c93d53fbe86d2fafd56 SHA-256: e6cfa8df8f98d2fdbb72970e564dae6eced512f0e0feae165d098dc36a52419e
162 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 for a malicious redirector link pointing to 'https://gettraff.ru/strik?utm_term=dreamcast+emulator+apk+bios'. Additionally, a machine learning classifier flagged the PDF with high confidence, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The presence of a visual download button further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?utm_term=dreamcast+emulator+apk+bios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5fa2e8459eb89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f875ca4c60a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fc5bc4e06645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5fcd8991e195c.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/fb57094c-b996-4189-ac31-31c990b203f7/kris_gethin_12_week_workout_plan_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6def16-cd66-41e6-bb83-44cc0ac2ecf1/bank_job_books_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1829e22a-b19e-41c1-bbbc-1d3befe3cab8/xubepudoxefoxadajomop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1956640-6b3f-4149-beb2-b9107c0b4525/sebald_austerlitz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bebb90-4977-4d3f-b359-3b6892b154d2/nazagabepitenutinibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f98fe1f-41af-4e5a-8c41-f7ee5756dd75/28512048864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a67e19a-3a64-434c-a906-fe5efb181732/21371876078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14939e3c-7afd-4dd3-b7b9-7833055a5f97/18206003457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5434e6c8-f7ae-4a1b-ad33-066526888ae2/towemotemukomiburis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec56f3e9-032b-4bcc-93ce-0a02ac73c871/vudobakoka.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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 5280 bytes
SHA-256: 33d39a8164fffcb3ad2f761227c5bf3ec72a553ad4eb448067747c4a6ae22016
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 11472 bytes
SHA-256: 7be839ac3da18959ce7afbaeacf6b60f0166f0db54331540b621f12d1e754fac

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