Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d9bfc10a81e6e6…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 00:27:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e171d1897361f711830d71ebe16e23de SHA-1: ac91dc4f4d2df21ee840de3ff1311324edc799d6 SHA-256: c4d9bfc10a81e6e68455ff6ea190e8eaec74e1d9b4be3c456473d4994cc23bfd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users. It contains embedded links that redirect to malicious infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-stream-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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/431946152/free-robux-stream-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-shower-simulator-cheats_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/robux-cheats-for-roblox-app_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-offer-walls_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/como-hackear-un-juego-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/wurst_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/pastebin-hack-robux-by-hacks-de-juegos-apk_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-kat-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/hack-download_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/fly-hack-roblox-lumber-tycoon-2-francais_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_off00002f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F35 22512 bytes
SHA-256: aad60d4eb49e47e1eb245d23359f0729ddf8e5d9069f0f0e0c2472cacfcf6ec4
font_01_sfnt_off00006169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 19080 bytes
SHA-256: 1c6afd9c6a74c9760f64a05e730cb8b9fe2917919de1f03b4396640c76df1420

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