Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb48e7566e10c1d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 14:21:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7a2eca91e2c04baf52d4182fba7b1042 SHA-1: 2cd81df8ce6b684d3d7745487473c557a01c587a SHA-256: 8cb48e7566e10c1d2cfbcb1ea27388f42c9260d93ea1bc6378194b14b5fc9b13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link that redirects to a known malicious domain, disguised as a 'Coin Master Hack'. This lure is intended to trick users into visiting the malicious site, likely to download further malware or engage in phishing. The ML classifier also strongly indicated maliciousness.

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-without-human-verification-2021-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/change-stat-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/cheat-roblox-speed-simulator-2-codes_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/dantdm-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-free-item_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-capes-for-roblox_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_002_off000030a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A3 23248 bytes
SHA-256: c71cbc25996129da383ffe0f298f0d5265af7b014684a6b043135d42b8556072
font_01_sfnt_off000064fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 19304 bytes
SHA-256: f8861b3c9aaf8f1d50bee1847069a40ba50e39d84bb43402706f5c77a0ef7414

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