Malicious PDF — malware analysis report

Static analysis result for SHA-256 1431555fa05e7776…

MALICIOUS

PDF

35.4 KB Created: 2021-07-01 08:24:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 54e72c3092472db4b3d9ffac73abc394 SHA-1: 9f038672fba69c4a11a94659f8484caa67ef0e7a SHA-256: 1431555fa05e7776f5ced087daec23e424c07af7aeb15acaf58f75f54db72d68
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to known malicious redirectors, including one that promises free in-game currency. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to further malicious content, aligning with a phishing or social engineering attack.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://netcdn.co/app/431946152/things-that-are-for-free-in-roblox-game-hack In PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/robux-hack-tutorial_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-and-builder-club-claims_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/pastebin-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/hot-to-hack-roblox-on-mac_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/new-hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/nomnomnom1-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-for-kids-easy_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-without-verify_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_off000032d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D8 22728 bytes
SHA-256: 84e8c4167572ff495b112a3f41bcb59bb6b3243ee0046455d6eceef761994bb3
font_01_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 19040 bytes
SHA-256: 7d15304463968aac1b13d0ff58e47683d9be5dedd5b52bdc27af85bb2841d159