Malicious PDF — malware analysis report

Static analysis result for SHA-256 f952f85d3bdc5c01…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 12:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 472a69b427b447f301abf58df6bb8106 SHA-1: 5babde23bb77ef28adcd3f80079e48d34239a53f SHA-256: f952f85d3bdc5c0122a6479b5b507fa7ebdfb0b6f048fb146f43d6f1b6e9869d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux generator" which redirects to the malicious URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verification-game-hack. This indicates a phishing or scam attempt, likely to trick users into downloading further malware or providing credentials. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/how-to-get-free-robux-without-verification-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-roblox-games-on-ios_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/generator-free-robux-facil_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/group-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/get-free-robux-legally_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-inspect-element-no-wait_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-stella-exploit-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/before-he-cheats-id-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/codes-for-free-stuff-ib-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacks-para-tener-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/blood-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-noclip-hack-download-ios_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-generator-cheat_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_off00002f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3A 21920 bytes
SHA-256: 1daaba313e9f2c9c3f7bf5041bf1326aea1e66089d35895f9721ab522815171b
font_01_sfnt_off00005f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F82 19604 bytes
SHA-256: 58b409e880d8c8c8f611c8851265b785a46b2984af904f55916f4ac6f211fe18

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