Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dce4e8f326596d1…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 18:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2a362f52483718ded7b740156a43e51 SHA-1: d3fb81f88bed92610d65c59b8c05954e2b633c5f SHA-256: 4dce4e8f326596d1fe2a5f76a24187021c0291c7d3f80822a6a8661ec0f01b14
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. This URL, https://netcdn.online/app/431946152/free-robux-no-verification-needed-game-hack, is likely part of a phishing or malware distribution scheme. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/free-robux-no-verification-needed-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/pokemon-go-free-shiny-celebi_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-tik-tok-quiz_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/2021-free-spins-coin-master_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_004_off000053ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53EF 25080 bytes
SHA-256: e1876e96909c1d2aa0cb73897f8b77b8f5f62dbbc94700ed693b6fce3e86a4e3
font_01_sfnt_off00008dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFC 18776 bytes
SHA-256: d142001b9e8124b93d34dd5eb493ac1502906b177ba9fa7077e4038994baf40d

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