Malicious PDF — malware analysis report

Static analysis result for SHA-256 179343d759cb0af8…

MALICIOUS

PDF

48.4 KB Created: 2021-06-11 00:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 693740c40ba74baf15a3ad9bfa481765 SHA-1: eda8a4100466a332b202e3dc4ccd9de00784dfc2 SHA-256: 179343d759cb0af839b9d9fa5220bcc3f3e7263f8efa9566708bb3e15c53a270
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a lure related to game hacks and free in-game currency for Roblox, a common social engineering tactic. It contains a fake CAPTCHA prompt designed to trick users into clicking malicious links, such as the one pointing to 'netcdn.tw'. The document's structure and embedded links strongly suggest it is intended to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-stuff-on-roblox-catalog-2021-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/my-account-got-hacked-what-do-i-do-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-survivalist-hack_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/download-minecraft-java-edition-free_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_off00004f3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3B 27200 bytes
SHA-256: 7b94334c2ca96287e34ba3827b89af4c8b898a73a160033021c57434680b1782
font_01_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9735 19272 bytes
SHA-256: f38665816855756673de83c5782c2242eda4665a3885750914a413ffcf33b966

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