Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ae20eb9c5bc9bb…

MALICIOUS

PDF

32.8 KB Created: 2021-06-27 08:24:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d0c615a2067ca4b6c4dfa8c6225bed45 SHA-1: e2f95d56b2381b6ca885b797a536587752350bc3 SHA-256: 79ae20eb9c5bc9bb6036762c117289a8a0d0f3d782134cefda0b6ec992c37a1f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple invisible links and CAPTCHA-themed lures, directing users to websites promising free game currency or hacks. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a phishing or scamming attempt. The document's structure and content indicate it's designed to trick users into visiting potentially harmful sites, likely as part of a broader phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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 http://netcdn.co/app/431946152/free-robux-no-captcha-game-hack In PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/cool-roblox-costumes-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/hack-nuevo-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/how-to-hack-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/level-7-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/how-to-get-free-robux-batu_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/speed-hack-roblox-ccv3_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-robux-hack-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-robux-2021-xyz_GM431946152.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_001_off00002aaf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AAF 21892 bytes
SHA-256: 49d5eeffe74cf5456a0e7d1c7fef6168f09884e6d924761154ec3f8bbe919163
font_01_sfnt_off00005b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 19160 bytes
SHA-256: 77aa747f8909c34181c037c59faeb0b8e2ffcccfd607e6911d22ee2a35da0cea

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