Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8d577f1a2f215e…

MALICIOUS

PDF

50.5 KB Created: 2021-06-09 12:43:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9c448402a3d02052905ef6c8456d07f3 SHA-1: 984a6635550d8faa4eaa881b20b359620a571ff9 SHA-256: 1b8d577f1a2f215e819edac2dfda406f0ea4d8f5592142e54fe8c2d2983576fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures for Roblox. The document body, though heavily obfuscated, contains references to these lures and the authoring application. The presence of multiple redirector links strongly suggests an intent to distribute malware or conduct phishing by directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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 https://netcdn.tw/app/431946152/free-promotional-code-roblox-game-hack In PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/robux-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-hack-gui-tutorial_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-fly-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/one-piece-millenium-roblox-hacki-book_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-apk-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/pin-robux-free_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-roblox-hacks-like-jjsploits_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/uribx-club-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/300-roblox-accounts-free-v3rm_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/obby-gives-you-free-200k-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-catalog-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hao-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-recover-a-hacked-pin-in-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-on-a-tablet_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-download-chip-windows-7-free_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/admin-console-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hacked-roblox-spray-id_GM431946152.pdfIn PDF document text
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-robux-no-verification-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005337.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5337 27424 bytes
SHA-256: ce2e078e5bd5d440e97a78df7d625418c574b07026e55efba150445e834c4ede
font_01_sfnt_off000093cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E0 18988 bytes
SHA-256: 3a77bdc2989d6bb2e54f0495a862d730200085c513915e0ee7b7955ebd45d0dd

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