Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b5d1df112b4e46…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 00:49:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 922392b792110b36a3ce10b4be9c01a1 SHA-1: e95e5e3b93eb1b60de2c4e8139d47157884857ff SHA-256: 82b5d1df112b4e4602bf1faa86d4075554233f831d745db27fe607d13120042a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and a document body that explicitly advertises 'free generator / game hack' lures for popular games like Coin Master and Roblox. The primary link, http://netcdn.tw/app/406889139/coin-master-free-in-app-purchases-jailbreak-game-hack, is flagged as a high-severity lure. While no scripts were extracted, the PDF structure and embedded URIs strongly suggest a social engineering attack to redirect users to potentially 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/406889139/coin-master-free-in-app-purchases-jailbreak-game-hack PDF link annotation
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-promo-codes-2021-free_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/fast-and-easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-explorer-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/hack-game-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-password-roblox_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/get-tiktok-followers-free_GM835599320.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_off00003234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3234 22436 bytes
SHA-256: fc434f1efe3de21851d3371e2d85770908205eacf61041f82155935c649b8573
font_01_sfnt_off0000640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 19200 bytes
SHA-256: c58b163cac73c5ceb81e9441a7c609bf1cfe332a117e293dde2278b346e293d0

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