Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf976c5c8e4d954…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 11:15:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: edd66f101794c6a19cc0909febcd8153 SHA-1: e181a524a8276359ee813351454bf8b0d251cc74 SHA-256: baf976c5c8e4d954a87ad5452eafae4d9071bc04fe9dbf859842dd21fe521158
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and text referencing free in-game currency and hacks for popular games, such as Roblox and Coin Master. The primary lure URL, http://netcdn.tw/app/431946152/free-robux-app-2021-game-hack, is directly linked to a 'free generator / game hack' lure, indicating a scam or phishing attempt. While no scripts were explicitly extracted, the nature of the lures and the ML classifier's high confidence suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-app-2021-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-ghost-simulator-cheat_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-admin-panel-hack_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/hacker-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/master-game_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/triga-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-joshy_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/codes-to-get-free-robux-2021_GM431946152.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_off00002d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D47 22020 bytes
SHA-256: 7dc1c8ac3ee48714be10860a25482f01929821dd711638e4fa3c290c0504d805
font_01_sfnt_off00005e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 19296 bytes
SHA-256: 2b5381b15c79e36d66fe09b00355aceabc7985a3bbfcc95a7c6d6095c4563c1b

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