Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b21bc156f70150d…

MALICIOUS

PDF

44.5 KB Created: 2021-05-19 06:15:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9dcb0179dc95645d74865f013045d262 SHA-1: e3ff8ae24fb97b0de093cab67ee62214f89d1b4f SHA-256: 7b21bc156f70150d8c7b91096210be32a8b2d32d1c6dd8a17d177404d05708aa
82 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, specifically pointing to 'https://netcdn.xyz/app/835599320/free-50-tiktok-views-game-hack'. This lure, combined with the ML classifier flagging the PDF as malicious, suggests the document is designed to trick users into downloading further malware. No scripts were extracted, limiting the analysis of the payload's behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/835599320/free-50-tiktok-views-game-hack PDF link annotation
    • https://au-ma.com/image/data/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/freerobux-co_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-realistic-minecraft-texture-packs_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_off000047bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BD 25460 bytes
SHA-256: ece6f896cedfbfc389645b89f0427167ea1cc75e21c80ddefdbeba2b1acf845c
font_01_sfnt_off000081c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 18060 bytes
SHA-256: 74788621514fb16adc4021deb384de90e3f7f45b7531d3fcfbda90cb884e906e

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