Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa12c3bbf9ed02f…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 12:17:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f81108ca98abe1af09e253273b472dad SHA-1: 5ab0eece4a041977c614395d2d7f2176403e3a62 SHA-256: 4aa12c3bbf9ed02f11b411cb8f38eec26ed0947c10fc2c2612890cf1624e13d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, directing users to the URL http://netcdn.tw/app/406889139/free-unlimited-coins-for-coin-master-game-hack. This suggests the document is designed to lead users to potentially harmful websites, likely for further exploitation or malware delivery.

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 http://netcdn.tw/app/406889139/free-unlimited-coins-for-coin-master-game-hack In PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/rbx-free_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/best-free-avatars-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-avatar-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-hack-on-android_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-do-you-hack-in-critical-strike-roblox_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-bl4z3gamesco_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/roblox-hack-tool-generator_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-glasses-roblox_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/atticus129-roblox-hacked-image-robloz_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
font_00_sfnt_off000030bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BD 23008 bytes
SHA-256: e51aab09ad4b968c6f83272e598b1cf10671f4e2eef775f26887a55dd32d0d05
font_01_sfnt_off0000646f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 18692 bytes
SHA-256: 36a19bd20cb883ca51bc1b34291fa92e3528edb78ec616d243bb8f2f27194c6f

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