Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d1a6a1c1c8372…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 07:43:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e637c196cc14621f8fdb45829625a29 SHA-1: bec40305b00957ee4393990488f37d49c313d3c6 SHA-256: e28d1a6a1c1c8372c33d1d7c914c3bb91447b35ada056ebfa601b4fee4383c6c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Coin Master Hack Trick 2021'. The document body, though heavily obfuscated, contains references to the same malicious URL. This indicates a social engineering lure designed to trick users into visiting a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-hack-trick-2021-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-daily-spins-today_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_off0000522d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522D 25108 bytes
SHA-256: 117543c684156434e394f339a91668076f61fc2d718a60b3d29886568c6e6416
font_01_sfnt_off00008c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C09 18116 bytes
SHA-256: c4260f5e787f6e7dffce264d62518f3a61bcf9e6f1fccfaba9053fe678d6f70c

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