Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df622297289f3fc…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 09:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 05b89ce5d1dbf5fadd8feb613d6c9114 SHA-1: b1d590beaa47c736afd2eba2fcd85495db2b3b28 SHA-256: 4df622297289f3fc4fd96ee816ef3bb95886662b63865e3f6fc3ab537f3cf9eb
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-games-on-roblox-game-hack, which is designed to lure users with promises of game hacks. The document body and embedded URLs reinforce this lure by mentioning 'Free Robux Games' and related terms. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to malicious sites via embedded links, likely for further exploitation or phishing.

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-games-on-roblox-game-hack In PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/roblox-troll-shirt-free_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/hack-with-no-virus-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/hacks-for-roblox-dragon-adventures_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-fnaf-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/hacks-for-cbro-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-model-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/robux-account-hack_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/is-roblox-hack-safe_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/como-usar-cheat-engine-no-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/long-pastel-hair-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/infinite-robux-hack-2021-script_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/hacks-for-piano-auditoriam-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/whats-robux_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_off00003032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3032 22056 bytes
SHA-256: 49a4fc482d6bba68f118b00d639a0d1c3414f3ee02891c8cf94593bf95ccdded
font_01_sfnt_off0000614d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614D 19052 bytes
SHA-256: 56f4e65812c403ac511da7c683eb66c8172328fd08918d47063ad90a487708b4

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