Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e71771d93a7d7b3…

MALICIOUS

PDF

35.7 KB Created: 2021-06-29 18:20:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 57eaaf8f91afab181c5c608838301935 SHA-1: e6e99f32c40abaa283646b308d76605488a40eea SHA-256: 4e71771d93a7d7b39b1f471224db5c60fa487eaf538bed479653748a4aa84a8d
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and generators, specifically mentioning Roblox. It contains multiple embedded URLs, with one identified as a malicious redirector pointing to 'http://netcdn.co/app/431946152/roblox-we-are-devs-hacked-game-hack'. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

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/roblox-we-are-devs-hacked-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-easy-money-cheats_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/hoew-to-fly-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-robux-without-playing-a-game_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/wie-kann-man-wie-kann-man-cheaten-bei-roblox-geld_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-roblox-jailbreak-private-server_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-generator-may-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-accont-hacking_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-project-pokemon-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-roblox-accounts-with-lifetime-obc_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_off00003241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3241 22860 bytes
SHA-256: c33660c1e8fb5dd38e9745bf6fb2e06ccd29cd59c2a52a8d5dfbb6fd9c1ae5ce
font_01_sfnt_off0000658e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 19312 bytes
SHA-256: 290cd7c38bced5a0f36582b5a8fc2054ebd05aa686963a06af88a930d35893cc

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