Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d90ceb541aef5e…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 23:43:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4255ed9f6095504da5976cc539960a3c SHA-1: be73cf1c7b3152e0f89597b03bcbb26c6e04bae2 SHA-256: a8d90ceb541aef5e5552bc7ae0793a0a0ffc062abd9cc3bf8f02e14807673a4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The primary lure URL, http://netcdn.co/app/431946152/admin-cheats-roblox-game-hack, is flagged as malicious. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting these sites, likely to download further malware or steal credentials.

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/admin-cheats-roblox-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-everything-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-ban-script-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/beast-mode-roblox-free_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-tiktok-followers-500_GM835599320.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-no-survey-2021-june_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-pastebin-javascrit_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
font_00_sfnt_off000030d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D8 22152 bytes
SHA-256: 2545dce9a72442f0ae7a05db9b2912556c6c840de96310aec6af7143d7c2ed29
font_01_sfnt_off000061c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 19312 bytes
SHA-256: a389664d46c7fc197739fcc7843ff19f86640597ce50b0209dadc4b00aee11ba

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