Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fd7541d333f9c5…

MALICIOUS

PDF

48.9 KB Created: 2021-05-16 14:35:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c0c148ea0a102a99d71c6957cb0c4df9 SHA-1: ccf1dc7ce1c6d9bea81431822a8c54fb9dc6d9a6 SHA-256: 42fd7541d333f9c5f7f5c6119c1003b326126bae14eb2008563fe00494ed1b17
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a game hack lure, specifically targeting 'Coin Master' and 'Robux' related cheats. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-free-spin-link-today-50-game-hack, is the primary indicator of this malicious intent. While no scripts were explicitly extracted, the nature of the lure and the ML classification suggest the PDF is designed to redirect users to potentially malicious sites for downloads or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/406889139/coin-master-free-spin-link-today-50-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAE 24572 bytes
SHA-256: 14217bc47a088c9c8ebd0bbfacfe1b4c1bd1be9c7042b9055d90d35c982e441a
font_01_sfnt_off00008341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 4092 bytes
SHA-256: 5f209d2de47fc1d1daa3f7a159899a6156681217a4da0d2c4432eb95998bf980
font_02_sfnt_off00009118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9118 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B07 18716 bytes
SHA-256: 34d71a1e16074585b92cedabb87dd12f76b262856d377b8410846490f9b2f930

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