Malicious PDF — malware analysis report

Static analysis result for SHA-256 728383921b807dae…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 19:38:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64327c18f6ecce6c0eb6a51e35a1f7fc SHA-1: 12f8685060fe48a2f4c682dee982b10e7fde8c36 SHA-256: 728383921b807dae5525470ed81979f1f35d746ab561310752c85de5255a6491
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/431946152/how-to-buy-robux-for-free-game-hack, which is designed to trick users into clicking through to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/how-to-buy-robux-for-free-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/noclipper-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-run_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-use-hashes-to-hack-someone-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-net-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-items-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-cheat-in-fame-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-bear-mask-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/avatar-roblox-free_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_off000030dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DC 22436 bytes
SHA-256: 99e517b3d0252d4be9d02e23bc3dde1476ae692311030b5d575148c92d3d34b6
font_01_sfnt_off000062ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 19060 bytes
SHA-256: ef5b7f60cf1fa637b1bfb552d40134022e1bfb8af4691738e10ad17902957aec