Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22bc2c040e5cd3a…

MALICIOUS

PDF

48.2 KB Created: 2021-06-10 23:43:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 62d53802c0daa0a3c69f5605fd60537c SHA-1: 9bb49f3163f9bb301333dbf4c9f95e13e4ecf4f3 SHA-256: e22bc2c040e5cd3aab15e7d368d964cda7eb01cad8e22460da8f4822475a2c69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of offering free Robux and game hacks. The document body and embedded links suggest a phishing or scam attempt designed to lure users to malicious infrastructure. The presence of multiple redirector links indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/robux-free-generator-no-human-verification-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/tiktok-watch-free-movies_GM835599320.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/can-lucky-patcher-hack-coin-master_GM406889139.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_004_off000052a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A5 30100 bytes
SHA-256: 027c573ab31be1156ee66d1dba7e51e3319cfd5b5dd9487884dacc6e34dca3fc
font_01_sfnt_off00009845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9845 18860 bytes
SHA-256: f4900c7011c96e8de8682a5125e3d2212993d32ce49587a35de66c33874e572d

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