Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3a79ade86c691f…

MALICIOUS

PDF

48.4 KB Created: 2021-05-17 13:42:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 12c9b7847bf4336b6a2abc2247d16edf SHA-1: ea51ff5c29d23e8de131588e2ecb580ddecb87b4 SHA-256: fd3a79ade86c691f9476f139078a0b046fa286246cd1fa3e7ee2890a253ae405
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' lures. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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
  • 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://netcdn.xyz/app/431946152/free-robux-websites-that-actually-work-game-hack In PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B81 34788 bytes
SHA-256: 1f4a5b7438e796d0e5dbe2136a71e304c7e0498031c6423f3069a4ecf8b68d12
font_01_sfnt_off00009851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9851 19252 bytes
SHA-256: f49525d2cb353299e95430044cca9c62699809686ebb763340304ea0e82a2cbb

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