Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d21d939829c383f…

MALICIOUS

PDF

44.6 KB Created: 2021-05-17 13:48:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 15e968647228aae22be5224c151fac1f SHA-1: ad022b8f2622616c6cbb9e653173c0c2fcc7d701 SHA-256: 2d21d939829c383fc4d88517213ffae348dae859075b36e32a3641b137dac57f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and free currency, directing users to a malicious URL. The document body and heuristics indicate a social engineering tactic to trick users into visiting a potentially harmful site. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

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/431946152/getrobux-ninja-game-hack PDF link annotation
    • https://www.unicor.co.th/assets/editoruploads/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-download_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/give-free-robux_GM431946152.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_off00004711.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4711 25192 bytes
SHA-256: dd4149965145289da125bf7e25c10508db218a96cc5e1f94cf9c37d777e48144
font_01_sfnt_off000080fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 2924 bytes
SHA-256: 850a376b860f565881a588f8364b75fee17872cf4b920c128fd450a972f35739
font_02_sfnt_off00008b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B21 18492 bytes
SHA-256: d23b7c5832d9f3375e6d59d692932375930e92cba448a5500249390e72a71ae2