Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50126bd466ffde9…

MALICIOUS

PDF

35.4 KB Created: 2021-06-19 19:42:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ab55d9b36e912a05e51b9c2525e8193 SHA-1: bfd41ae71b3f1d300fbfd0c28af963291d461871 SHA-256: b50126bd466ffde984788b5946ccf0c30887f89c110995d8cc3ab10b2fb28322
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with themes like "game hacks" and "free spins" to encourage clicks. The embedded URLs, such as http://netcdn.co/app/431946152/cant-hacking-to-pokes-acount-in-roblox-game-hack, are indicative of a phishing or scam campaign designed to lead users to potentially malicious websites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/cant-hacking-to-pokes-acount-in-roblox-game-hack In PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/anyway-to-legally-get-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-devil_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-toys-for-free_GM479516143.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_off0000328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328E 22828 bytes
SHA-256: f0157bf8089d892137559ad264d92af09e6cbfc718b6b3e45fdcf21debfbec84
font_01_sfnt_off00006527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6527 19176 bytes
SHA-256: 7206bc28416f496aff2326c9fc3ac40c80b3b2bccc02c59f54c81d28f1e9f3bc