Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfcf5e3f6f95ca5…

MALICIOUS

PDF

33.6 KB Created: 2021-06-18 07:54:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9be25a760ae8de4a77abad252fdb7d0f SHA-1: 97cf1b213d05a96e8d12ffae167d711d46ed4682 SHA-256: acfcf5e3f6f95ca553e1bd1ea26d765c389c9cddf434e3f582ff1b8076a3f672
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as 'free generators' or 'hacks' for popular games like Roblox and Coin Master. These links, such as 'http://netcdn.co/app/431946152/roblox-cool-free-t-shirts-game-hack', are designed to redirect users to malicious websites. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://netcdn.co/app/431946152/roblox-cool-free-t-shirts-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-para-tener-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/robux-game_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/cache-http-thebuxiancom-howtohackanyonesrobuxandstealit_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-install-a-hacked-client-roblox-mac_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-domain-for-minecraft-server_GM479516143.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_off00002ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED6 21784 bytes
SHA-256: 01194a406e72baf589348ef4f41cc2357aa936c68d11dad4713c06a5f26e324d
font_01_sfnt_off00005ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC0 18888 bytes
SHA-256: a4c455d55ccea623ca8c964d1660444ebfc40d737a476cd6084d70474a74745f

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