Malicious PDF — malware analysis report

Static analysis result for SHA-256 5528c0a99b4fdeca…

MALICIOUS

PDF

43.3 KB Created: 2021-05-16 23:34:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7887fdd3f7abd2004afb7181a6868c4b SHA-1: b54f8c93d1fbbb08383f483ce36646613cfa1701 SHA-256: 5528c0a99b4fdeca6e187a3b20fa825ccf06f68a747dcf2db55501d91321be6f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'game hacks' or free downloads. The primary malicious link identified is https://netcdn.xyz/app/479516143/free-minecraft-svg-cutting-files-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a lure designed to redirect users to potentially harmful content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/free-minecraft-svg-cutting-files-game-hack In PDF document text
    • http://www.alpaca-buitensport.nl/images/mobihack-net-roblox-hack_GM431946152.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/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-live_GM431946152.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/hack-a-game_GM431946152.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/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-blogspot_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_off00004c65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C65 25764 bytes
SHA-256: 3a34b2063521e454f083f18a275d27a61ebdbd6dc014979841032ead4e62712b
font_01_sfnt_off00008731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8731 18184 bytes
SHA-256: d8adc23434b6d0e05f295f09c84840afdc38f50d3441e35b803418cfc3e40aac

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