Malicious PDF — malware analysis report

Static analysis result for SHA-256 404fa037c315746e…

MALICIOUS

PDF

42.4 KB Created: 2021-05-11 16:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9da0677d1dc479ea37b00b03efd9762a SHA-1: 0c93c28c92300e5930c893977e4558742dc00d92 SHA-256: 404fa037c315746e7ed142cf374888ee30d7af9303a40835e2b4addc97d4a3dc
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA to trick them into clicking. The primary link, 'https://netcdn.xyz/app/431946152/earn-free-robux-today-game-hack', is presented as a game hack generator. This indicates a likely phishing or scam attempt, potentially leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/earn-free-robux-today-game-hack In PDF document text
    • http://halal-center.ru/images/roblox-devil_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://halal-center.ru/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://halal-center.ru/images/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/easy-how-to-get-free-robux_GM431946152.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
stream_003_off0000480c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480C 26492 bytes
SHA-256: d1bd71147fd278cf19372cdfa32d1043c708fd8681659e96a96936b685394344
font_01_sfnt_off0000827e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 18596 bytes
SHA-256: 856adb635f1df42b1ab7aec7f905735c2cb2dfebd4088312a1c80dc48447787c

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