Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50a78b636b1e450…

MALICIOUS

PDF

51.4 KB Created: 2021-06-11 01:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 92c0283860d553dfc9a6683afb8d9f36 SHA-1: 5e6c144db006fc0649f9e3d471416687ab724456 SHA-256: a50a78b636b1e450b5bfcb168dddf83f814208f3cef1453fe00de11cd1d6f5c7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for linking to a 'free generator / game hack' lure, specifically for Roblox. The embedded URLs, such as https://netcdn.tw/app/431946152/roblox-play-as-guest-free-game-hack, are likely intended to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in game cheats to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.tw/app/431946152/roblox-play-as-guest-free-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-wizard-life-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pokemon-go-free-event_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-jailbreak-games-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-sign-up_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-apk-114_GM479516143.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_004_off00005209.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5209 30164 bytes
SHA-256: cae4d6ef51648a234b8c27501a585d3a627fa2cde42056b714880f31a6a2add8
font_01_sfnt_off00009843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9843 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off0000a4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CB 18756 bytes
SHA-256: 536746ef029180016b10674303df9b70bf6b2620163374f544b37f1543ff13dc

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