Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd41962a3e62adbf…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 00:35:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c32d41d72447190da42b1f4e53740f6c SHA-1: 8dd27a5a041aaad0d72bf67eb7c553af5450c229 SHA-256: fd41962a3e62adbfaa871e6b7503062858b7abca37fd3e4154a4df8d5498f452
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious. The document body and heuristics indicate a lure for free in-game currency (Robux), a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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.tw/app/431946152/robux-come-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-joystick-android_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/t-shirt-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-for-free-install_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-coin-master-app_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_off0000333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333A 21984 bytes
SHA-256: d2a49cbfdb824c4a16cd5fe6e5db985d5c36727f03c16598f50eec62cf7afd27
font_01_sfnt_off000063cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 18812 bytes
SHA-256: 41c84c3c584f004dc3b1ffc77961bb9dca2d9036d9ddb135d51b21e66fde0662

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