Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb104cbeeee70686…

MALICIOUS

PDF

44.8 KB Created: 2021-05-19 04:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 90d1f1fd8e46e76eb9b51c2017d8f449 SHA-1: e6d2ccad3f381b90c0300329b7c3c2c1023da05c SHA-256: eb104cbeeee70686b045a38b1f856ae473f50e292b5bea0e3d0a5ebc7731a786
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one identified as a malicious redirector, that lead to sites offering 'free generators' or 'game hacks'. The presence of a visual download button further encourages user interaction. The primary link, 'https://netcdn.xyz/app/406889139/coin-master-free-coins-and-spins-2021-game-hack', is likely intended to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-free-coins-and-spins-2021-game-hack In PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-robux-app-real_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
stream_003_off00004c49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C49 29840 bytes
SHA-256: 8b55642aa1cf7abd63a0ad6e50417168938039d865c9ea4270ff38dfefb038be
font_01_sfnt_off00008c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 18460 bytes
SHA-256: 9b9248072d2421e664493d6d5ab14406474bc62db1d786ff94b6c1680f0f8261

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