Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b53de08efee4ead…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 11:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e70140eaaeab376e43fd3ec0dce2ad60 SHA-1: d730d5ac7c4ded4a75900a3f7b6f2410515c11a5 SHA-256: 4b53de08efee4eadad0ffddfddf4206d64656b416cbc54ab32be51f11a0233cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into downloading potentially harmful 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.co/app/431946152/free-exploit-download-roblox-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-tom-get-games-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/uirbx-club-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/jailbrak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/good-unifrom-making-software-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-undertale-game-script-hack-stats-giver_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-leaderboard-script-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/best-free-script-executor-roblox-2021-march_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-clothes-or-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/google-how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-galaxy-money-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/jailbreak-roblox-hack-mega_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-dont-sign-up-for-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_off00003064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3064 22024 bytes
SHA-256: 923be9539186ac13c57d6d536de2beabcf242485dd987a551e627f0998fd7772
font_01_sfnt_off00006143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 19556 bytes
SHA-256: 59f95c57154dd29c6ebb118711c05732f0af12b9a3cc1517ac734c74d162337a

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