Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d35965161edbb…

MALICIOUS

PDF

33.7 KB Created: 2021-07-03 19:24:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b6b0028b439d7e49c683ae92dcf2c90e SHA-1: 462c247dbde94416a41eb3ff30f8d49e143bd2a2 SHA-256: 043d35965161edbb46be98970079df28d527f8a7a6f2290bea9c4cc80ab81dd8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic firing for a 'free generator / game hack' lure, directing users to the URL http://netcdn.tw/app/431946152/can-i-get-robux-for-free-game-hack. This URL is likely the initial stage of a phishing or malware distribution campaign. The document body and numerous embedded URLs reinforce this theme of game hacks and free currency, indicating a social engineering attempt to trick users into visiting malicious sites.

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/431946152/can-i-get-robux-for-free-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/tik-tok-free-fire-judul-lagu_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-hack-robux-and-tix-download_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-app-hacks_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-how-to-get-the-sqaure-body-for-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-money-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-robux-hacks-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-human-verification-no-inspect-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-free-download-for-macbook-air_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-come_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-by-joedaddy_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-4all_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_off00002d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D66 22436 bytes
SHA-256: c07953f0abca45ac213b7036423134b7c609f25ecdec72c6913bae76487b82cc
font_01_sfnt_off00005f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F63 18820 bytes
SHA-256: a8ebb2e02c07fcee768b9c7d2548d14d4f98ce7ae4a3dab28d470086f2c44dd3

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