Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba159c82b64d32…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 05:28:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8650d0512069f9c60378a42fb4cd740f SHA-1: d5374dc19bfc3f3011e3df2664451886e526f6f5 SHA-256: f6ba159c82b64d32ef280847c344d6ba03d193104591f70982607c0de5f105f8
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms. The document body and heuristics indicate a lure to a fake CAPTCHA or human verification prompt, designed to trick users into clicking links that likely lead to malicious content or further exploitation. The primary URL points to a site offering 'free Robux' generators, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-robux-no-download-or-survey-2021-game-hack PDF link annotation
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-vip-server-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-do-people-hack-roblox-accounts-reddit_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-hat-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-no-survery-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-make-a-hacking-script-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-synapse-exploit-free-cracked_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/course-obstacle-2021-roblox-cheat-code_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-free-apk_GM479516143.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_off00004ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE6 30996 bytes
SHA-256: de821097072c80e951c22e6c50f053654a2bdb019f9a218b1a460ec1d37443a8
font_01_sfnt_off00008ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 19624 bytes
SHA-256: 27b765dad967e15f226bc2338c71f81b208b94b2f2f04648d494e8d8428f4788

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