Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99dd185ad8d16e0…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 00:43:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 96c177f879201e45e60fbc7b2f2233ba SHA-1: efabbf3b5e0aefaa452d6e4ac91a1b52b22cd171 SHA-256: c99dd185ad8d16e067bf58bca9d2a70e8c1fe7807ab1f97beffa5095121b64a8
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to game hacks, specifically for Roblox, directing users to a suspicious URL. This URL likely serves as a landing page for a phishing attempt or to download a secondary malicious payload. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hack-roblox-exploit-wearedevs-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/comment-cheat-sur-stand-online-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-no-human-verifica_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/no-scam-free-robux_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_off00004ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE0 26580 bytes
SHA-256: a973a481054f1ce37d5e6725534511f2c9a74e97b147feab3c19e0442d2d1c8a
font_01_sfnt_off00008a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A31 19068 bytes
SHA-256: b436374dc9534a5adc4fae099093a70871a3f985929f9c11fb3b4d43f412c268

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