Malicious PDF — malware analysis report

Static analysis result for SHA-256 5788b774b2365d15…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 03:55:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 51ea0a35d693aa64fc2837c261bcd8e5 SHA-1: 6d2845cb2b91e6c1e07e4c07382f2545d49ce228 SHA-256: 5788b774b2365d1560845560dd5b27eff8997614e9ab8c2cb90a213fa04b06eb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks or generators. It also presents a fake CAPTCHA prompt to trick users into interacting with the malicious content. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-peoples-accounts-on-roblox-2021-game-hack, which is associated with redirector infrastructure. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-peoples-accounts-on-roblox-2021-game-hack In PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-roblox-link_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/hacking-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-to-hack-peoples-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED0 25468 bytes
SHA-256: 277d3dc5dd7131d7c72858e204f6fc9a810813f0541918da63f025defc8bd5fa
font_01_sfnt_off00008a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 19324 bytes
SHA-256: 3242234df0eeb04fd74697105a951b5e5373eb3f503a8a2c3a775ebae622b24d

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