Malicious PDF — malware analysis report

Static analysis result for SHA-256 feffc7658bb1eccf…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 17:13:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6131fc46ab97e00515f061951eeb6657 SHA-1: e322ad14b6e137e69db825bc58c8555ca6d62826 SHA-256: feffc7658bb1eccfdfb57ce9dc410081f4c511e210bb036a4153b9af8d3a72a1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and a textual lure related to 'free Robux' and game hacks, indicating a social engineering attempt to entice users to click on malicious URLs. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests this intent. While no scripts were explicitly extracted, the nature of PDF documents often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing via attachment, aiming to redirect users to potentially 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-generator-game-hack PDF link annotation
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-instant-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-hack-roblox-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/adopt-me-pets-roblox-how-to-get-free-bucks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hack-v30rar_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hack-download-mega_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-spins-coin-master-2021_GM406889139.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_off000035fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35FA 21884 bytes
SHA-256: 73d29056004e916834868a5495cc09c91db80d5ab006697dfd4da176fd98ca40
font_01_sfnt_off00006648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6648 18820 bytes
SHA-256: da2f915db23b41a878f83961178ff4e79d82bfec54ff52f4ca014625624765bc

Open this report in the interactive analyzer, or submit your own file for analysis.