Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b0a3ffe15d5933…

MALICIOUS

PDF

52.5 KB Created: 2021-06-09 10:51:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 877e47115c3ef0d48032f641e800bf03 SHA-1: 5866a8093c021653cbb26e9b15fc55a635ef1423 SHA-256: 43b0a3ffe15d5933ae1694ec504cd3577774ef03ddf4b6ae2d2085792f54faa4
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a download button lure to deceive users into clicking a link. The primary link directs to a game hack generator website, indicating a social engineering tactic to drive traffic to potentially malicious or ad-heavy sites. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in game cheats for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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-hack-in-roblox-2021-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-800-robux-free-gamekit_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-xyz_GM406889139.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_off0000553b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x553B 29548 bytes
SHA-256: dbb2d58d8ce1c9d38e85049677ac0bab5a7165031a23a3655092a23da5552b8a
font_01_sfnt_off000095f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F9 5764 bytes
SHA-256: 2269e0ba857bbe9556f89aa5804cc693312949a52a6e776680609ed237d122f4
font_02_sfnt_off0000a923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA923 18748 bytes
SHA-256: e486a99c034185ff17ebc1e6c1a00f670c7090325bf8dbaa0e6c970f641255d7

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