Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c74b73af21b88d…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 23:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d13e1e5257ddd3603c4f30e91fa30e1b SHA-1: e16124446b606b6e6d8432cd66e6d3c7a4ea31fc SHA-256: 77c74b73af21b88db75ed50f6dc2a237b6457353a21b263466deabe1ed6ddb4e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a lure related to game hacks and free in-game currency, strongly suggesting a phishing or social engineering attack. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a redirection to potentially malicious sites designed to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • http://global-brand.net/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/weird-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/spin-link_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-master-spin-daily-link_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_off000048eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48EB 24796 bytes
SHA-256: 22f0fd675321350b6a01b88a69460b1221cef0f1a7924569af9220a41b641e6c
font_01_sfnt_off00008191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8191 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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