Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9bdee84ed09a01…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 15:56:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6e6031dedb75e182cb53de6f940feb82 SHA-1: e80a969b77b624005d679bf99cbf8d6a6c5a29e0 SHA-256: bd9bdee84ed09a01a14f326d612444e27113d43c698bb2aceaac1a8c031ab733
82 Risk Score

Malware Insights

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

This PDF document employs a lure related to "free Robux" and "game hacks" to entice users. It contains multiple embedded URLs, with a primary redirector at http://netcdn.tw/app/431946152/bux-land-free-robux-game-hack. The ML classifier strongly flagged this PDF as malicious, indicating it likely exploits a vulnerability or uses obfuscation to deliver a payload. No scripts were extracted, but the presence of embedded links and the lure suggest an attempt to exploit user interest in game-related cheats to redirect them to malicious content.

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/bux-land-free-robux-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-esp-hack-script_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/piere-ware-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/is-there-a-way-to-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-scratch_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-friends-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-ninja-legends-cheat_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-quirk-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-for-mac-os-x-free-download_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/best-free-roblox-flight-simulators_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-get-free-gear-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-assassin-hack-coins_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-shirts-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-stuff-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hack-skyploit-v2-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-be-crushed-by-a-speeding-wall-hack-script_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-games-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-rixty-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-make-your-t-shirt-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-use-a-roblox-hack-script_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_off000032b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B2 23180 bytes
SHA-256: 047a71d6dade186cfd89f7160c9f1a55b654148cd2405582409de751f9f928ce
font_01_sfnt_off00006734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 18888 bytes
SHA-256: 717b9ddb15dc58206ed84d046203dc29c9b72f3d9fa6466433d52ee550f30fe5

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