Malicious PDF — malware analysis report

Static analysis result for SHA-256 61edf3aea2d827da…

MALICIOUS

PDF

46.9 KB Created: 2021-06-10 21:45:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 21bda6625794d4ee1e9b08d5d380050e SHA-1: 72efe959cca9f67eb7a29ec502cdac7914f8a714 SHA-256: 61edf3aea2d827dad398171b3eeef5fd86a32ef2bb9b0fe136616fb4318eb5df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game hacks and items for popular games like Roblox and Minecraft. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-adopt-me-free-pets-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based social engineering attack designed to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-adopt-me-free-pets-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-ucuz_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-email_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-robux-hack-tool-no-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-super-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/noob-vs-pro-vs-hacker-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/10k-likes-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generater-no-human-verificaition_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
stream_004_off0000519c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519C 29072 bytes
SHA-256: a7667da7c0ac33b93c47f3b932521a54ac8298b8643bcea9d5a6568f8b2f150c
font_01_sfnt_off0000939d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x939D 18752 bytes
SHA-256: a111e2dc8205dfc00e4555b4d98f662ede2d97dc3f371afa84f139f680d29251

Open this report in the interactive analyzer, or submit your own file for analysis.