Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f90e8ed30987e7d…

MALICIOUS

PDF

43.4 KB Created: 2021-05-17 10:16:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9215cf2f68f387a08f77e47b8ac13698 SHA-1: dd61e9ea42a28540b873d269d1d08920a97f5cb8 SHA-256: 4f90e8ed30987e7d980d36bc47035f19ff10f372d2739e9001fd4614dc1b9074
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure related to game hacks and free in-game items, such as 'Roblox' and 'Coin Master'. The primary link, 'https://netcdn.xyz/app/431946152/cute-free-roblox-clothes-game-hack', is flagged as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a social engineering tactic to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/cute-free-roblox-clothes-game-hack PDF link annotation
    • http://hcberg.com/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://hcberg.com/images/robux-2021_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://hcberg.com/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://hcberg.com/images/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://hcberg.com/images/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://hcberg.com/images/robux-app_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_off00004520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4520 29696 bytes
SHA-256: 5ed16398897a1fafa45f99253123429b19261c9933e4dd0573b9dc47808eb9f6
font_01_sfnt_off00008725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8725 18360 bytes
SHA-256: e86e78400892ae5dd4aa52b188d1114de395e07e4f293bb7f48ee2d479d87499

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