Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba601b27b7505fb…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 16:09:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec1ec57a837b2748724fb60dce59b970 SHA-1: 67519942a7ff8d28565eb8eed693661380f40833 SHA-256: 3ba601b27b7505fbc82e0264a93ae97c101362a4b2d673f4d5a48ba17da09d44
82 Risk Score

Malware Insights

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

The PDF document contains multiple links and a lure related to 'free generators' and 'game hacks', strongly suggesting a social engineering tactic to trick users into downloading malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the redirector URL which likely leads to a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/479516143/how-to-start-a-minecraft-server-for-free-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/javascript-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/speed-hack-download-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hacks-para-todos-los-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/master-coin-hack-game_GM406889139.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_off000034d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34D8 22636 bytes
SHA-256: 1fc456371b5fa6920cd0c3ff92589bd6a7508c985650287c3ee68caf23fca789
font_01_sfnt_off0000675e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 18276 bytes
SHA-256: 5b06d09b2e4d23638ce6d3b7da2950f972f4b341437fc5afd30f64d4b098dc56

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