Malicious PDF — malware analysis report

Static analysis result for SHA-256 666f5093a199b5c7…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 02:38:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9dced77420458d36442237a754f6b4cf SHA-1: de255ad40e8f20bf0c2b4fcaba618f1f845be7b4 SHA-256: 666f5093a199b5c70d3463cfe78ebb6d4ddc7f75b4c47e95048da50827adca92
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to potentially malicious infrastructure, masquerading as game hacks and generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate a lure to download further malicious content. The ML classifier also flagged this PDF with high confidence, supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-2021-app-game-hack In PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-free-spins-on-coin-master-2021_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_003_off000049a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A0 24240 bytes
SHA-256: dc1111a07649e4f5400637e5e47fee9fb6df6c80463718402fad8a049125cbe4
font_01_sfnt_off000080b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B5 18296 bytes
SHA-256: 0171898879de63f826772f1aaca43c4afb825f5f143e0263167d5c085c4f41c3

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