Malicious PDF — malware analysis report

Static analysis result for SHA-256 84da31b9561aa7dc…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 11:55:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 336107173db5551af0fddc4ffb2468d6 SHA-1: 3c91dc17bff417fd48102756980ae8b7b1e8fff9 SHA-256: 84da31b9561aa7dccbf51b761f80a719f9e3a2313e2943f90e2647231f69e145
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector, that promise free game currency or hacks. The primary lure is for 'Free Robux' and 'game hacks', directing users to http://netcdn.tw/app/431946152/free-robux-no-human-verification-generator-game-hack. This indicates a social engineering tactic to drive traffic to potentially malicious sites, likely for further exploitation or credential harvesting.

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/free-robux-no-human-verification-generator-game-hack In PDF document text
    • http://lib.unar.ac.id//repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-no-human-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/are-decals-free-to-upload-roblox_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-patch-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/tiktok-free-video-download_GM835599320.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/get-free-spins-coin-master-2021_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_off00002f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F37 21928 bytes
SHA-256: 5d523dd86a1b279800d0e018ad487fa976c68aefc005973e6db630bd7566eaa2
font_01_sfnt_off00005fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 19336 bytes
SHA-256: 7dda9f1c66f8ad938334bacfca0b21453aa6b405ce0ba8c60d4a58d10419e0cd

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