Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8aa8c8037f2287…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 07:30:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c272b54e6be393384d8a63484d6f6fd5 SHA-1: 6a4b104fe3e1255d202291f977b44d06b8877786 SHA-256: 8a8aa8c8037f228717d1714ca89d57c5fa89ceb582e934bfb8f8c6e5672a5a28
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Coin Master Hack App 2021'. The document body and embedded URLs strongly suggest a lure for users seeking game cheats or currency. The primary malicious activity observed is the redirection to potentially harmful content via the URL http://netcdn.tw/app/406889139/coin-master-hack-app-2021-game-hack.

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.tw/app/406889139/coin-master-hack-app-2021-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-free-rpbux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/cheat-roblox-lumber-tyccon-fly_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/legit-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-likes-on-tiktok-no-verification_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hackerlol-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/steal-roblox-game-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fe8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE8 23216 bytes
SHA-256: 35977c9e6e37a8396d76198e9147b9edd8a33b883ceee280a5ce9974162d75e0
font_01_sfnt_off000063f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 18580 bytes
SHA-256: 988cffcfddd5284471d100489432d065995cf4e12f938595ec8cdf0110751cf2

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