Malicious PDF — malware analysis report

Static analysis result for SHA-256 b991a9a7633ed1a7…

MALICIOUS

PDF

35.1 KB Created: 2021-06-27 22:13:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 63d71b0a0ae7535f0df1a05d2ba9f185 SHA-1: 1a5245a5d604a041487c7ac5ea4ca5e4e40f6973 SHA-256: b991a9a7633ed1a7fd16530652e1da80bb4a2cabaf9e9bad6ff6ee60e54f6922
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirect URL is http://netcdn.co/app/431946152/free-hats-on-roblox-2021-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful websites, likely for credential harvesting or malware distribution.

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/free-hats-on-roblox-2021-game-hack In PDF document text
    • http://library.atim.ac.id/repository/cash-for-apps-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-de_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cbro-invincible-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-all-eggs-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-studio-beta-download-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-unlimited-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/10k-robux-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-accounts-on-laptop_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/discord-free-robux-server_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/boosted-gamer-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cheat-engine-money_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-speed-race-hacks_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_002_off0000303b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303B 22984 bytes
SHA-256: 2197b478063b2b65c3e5973857e68059eb2abbaf654cdb2d49955e70021816ba
font_01_sfnt_off000063c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 19156 bytes
SHA-256: 76f198bb33d1054252a5fe93e0e0231f2394ee59de6d1839d94078a9dba5ba0d

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