Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538dc6cceccd6ed…

MALICIOUS

PDF

45.3 KB Created: 2021-05-12 01:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a426ef55623d7604ec07d5ee1843748 SHA-1: 895f6a6c898534753801ce426eacfed239bf60ba SHA-256: 9538dc6cceccd6ed456c2bd52aea678d8670a9e6a628554a79a20efcd5a21361
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/robux-com-free-robux-game-hack PDF link annotation
    • http://gruporamos.do/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://gruporamos.do/images/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://gruporamos.do/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E1 24712 bytes
SHA-256: 229f102594f85525492ef0aa9e9096841f51ed94485a3a575afe9008298cbb8d
font_01_sfnt_off00008207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8207 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off00008ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC0 18276 bytes
SHA-256: 15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc

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