Malicious PDF — malware analysis report

Static analysis result for SHA-256 d227753ee3338863…

MALICIOUS

PDF

44.9 KB Created: 2021-05-13 06:03:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: edcb523649807c00365f16749b03ba1f SHA-1: fb3ccddc5da67aad5af9fb419b7c610e3352574b SHA-256: d227753ee3338863767a650e77a23e41ed11be30b9367df185b4489fb04519fb
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 embedded URLs suggest a phishing or scam attempt, likely aiming to deliver a second-stage payload or lead the user to a credential harvesting page. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-accounts-2021-game-hack In PDF document text
    • https://razredna-nastava.net/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-tool-v1-9-apk_GM406889139.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_off00004b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B29 27824 bytes
SHA-256: e61ab98e45afb66283c1b10b3d22790f9b792e9959e3f4f055b07ab7b55b8eed
font_01_sfnt_off00008c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6E 18520 bytes
SHA-256: 56624e41a965b33e02442574776651ebbc56d14fd3e4bfe95c3ae0db26e97c49

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