Malicious PDF — malware analysis report

Static analysis result for SHA-256 226b76defe386f2e…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 04:04:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9258bb391993f6a5bbfe6476bd2ef900 SHA-1: 73e80e4f9aaf1b82a46977be63f36a34f0b69f2e SHA-256: 226b76defe386f2e941b815a1931cd0d751bcfc0998f823055ca5c5a0b4b90d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a game hack generator, which is a common lure for malicious redirects. The embedded URL 'https://netcdn.tw/app/431946152/roblox-the-plaza-money-hack-game-hack' is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-the-plaza-money-hack-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/cube-eat-cube-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-com-roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/optifine-pe_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
stream_004_off00005603.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5603 25196 bytes
SHA-256: e95a538dd23c81d53f6456a178d02fc3faf4d77ce0086e787e6788b5c2cbe68f
font_01_sfnt_off00008fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE3 18960 bytes
SHA-256: fea49c6bf499ed8384fb4f79818871f9b5331a4854d0fa3168f7eeb216f34d43

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