Malicious PDF — malware analysis report

Static analysis result for SHA-256 81842afd6aa41d96…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 01:13:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e5f79e09dbd4200a2edce0c7a1469758 SHA-1: 26babe24636246d07e92a3314d563f894c7ce1d5 SHA-256: 81842afd6aa41d96c873236d6edc5b297600344bea7836990f6a0a857343b2fc
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically advertising "free generators" and "game hacks." The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-roblox-groups-with-funds-game-hack, which is likely part of a redirect chain to a final payload. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for client-side exploitation or redirection to malicious sites.

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/free-roblox-groups-with-funds-game-hack In PDF document text
    • https://www.gornjastubica.hr/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-roblox-accounts-with-robux-that-work-2021_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
font_00_sfnt_off0000462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x462F 24296 bytes
SHA-256: a4bb8f2aa89b9e3091213c9c6fbe3a6bc12f9e23f62a00690f6d54195f751f59
font_01_sfnt_off00007df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 19028 bytes
SHA-256: 3400496694c4b95422a50533d9ab07e9ced2fd8b85931bd61225c3b69c3e3d7c

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