Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b3c5b7ca24f12d…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 07:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c50e5f5aee8b2c26d7408f1e07c8f145 SHA-1: 1b45808e5417c97722270f3bbecae04d612376d1 SHA-256: 85b3c5b7ca24f12d1431c34724c8cb9c4002e022dc18cf9e8f8d72da27dea6e0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a known malicious redirector, under the guise of offering free game hacks and currency. The document body and heuristics indicate a lure for users to click these links, likely leading to further malicious content or downloads. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/835599320/tiktok-free-hearts-2021-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-mod-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/como-vestirse-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-or-survey-2021_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_off00003282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3282 21720 bytes
SHA-256: 5e813b618426f51518b20494f60cf17af8009180eeb740c286a5dbef0eb705c6
font_01_sfnt_off00006210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 18376 bytes
SHA-256: 3216537155007117b91e57a7abf7bbfd9b7dc3d8087420b5ec37eec4a3e4964b

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