Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceff6eefbe9a3bc…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 13:41:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3213232021e6fcb7507138e7bafc470c SHA-1: 513abcc0c47000b9523290c107635b8597ffc9a7 SHA-256: 9ceff6eefbe9a3bc1effde3c610c2841e5c1cfc224244db37d161e8a9d50b2f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links, including one identified as a malicious redirector, that promise free game currency or hacks. The primary link, http://netcdn.co/app/431946152/actual-free-robux-no-human-verification-no-offers-game-hack, is designed to lure users into a malicious workflow. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/actual-free-robux-no-human-verification-no-offers-game-hack In PDF document text
    • https://admin.9credit.vn/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-on-safari_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/redline-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/hacker-t-dog-roblox_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/web-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-make-robux-for-free_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/hacker-roblox-skin_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-spins-and-coins-for-today_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
font_00_sfnt_off00002f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6E 22444 bytes
SHA-256: bc485af34cea44ae216524be532451ae7d5ab474e22b2f3fcbc379641c5065a9
font_01_sfnt_off000061a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 19408 bytes
SHA-256: e099747c60f68754a24997f0883b7aee287251c4814d9cb0fe39beea786ad708

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