Malicious PDF — malware analysis report

Static analysis result for SHA-256 2222c13b1ac1570f…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 07:28:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 574e31fc733026bd566dffc0c88d011e SHA-1: 381a5b92096d260ab7988eda2d0d1028f87d902c SHA-256: 2222c13b1ac1570f239369ad9c5b89646f57fad6af13a2e18646b82541bb4f4f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The document body and heuristics confirm these links are designed to lure users to potentially harmful websites. The ML classifier also strongly indicated maliciousness.

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/best-way-to-get-free-robux-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-card-code-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-gui-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cheat-indetectable-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-there-a-way-to-get-free-bobux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-co_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_off00003077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3077 22432 bytes
SHA-256: f9c143165696d911e22ad22977cb6783080cac5b79bb97533bcc10f48d42cb30
font_01_sfnt_off00006278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 19196 bytes
SHA-256: 2484382544affe8c7e4aaa4b089d3f209c800c085aa3c8ec4a92e3ecd452fe92