Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8842d09263c75a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 05:11:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 377b911b92ac5b2105c6bd7b31c8252c SHA-1: d0d826b5c623cdb2eda6ea79da1545c30309f788 SHA-256: 1d8842d09263c75ad21a4140e54e3b2ec95085f1d387eeec9806bddb2c377f7d
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors and further malicious PDFs, masquerading as game hacks and free item generators. The primary lure directs users to 'netcdn.tw', which is flagged as a malicious redirector. The document's structure and embedded links suggest an attempt to trick users into downloading further malicious content, likely for credential harvesting or malware delivery.

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/406889139/free-links-coin-master-game-hack In PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/get-free-robux-in-5-mintures-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/earn-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-hacked-warning_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/catalog-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-free-cash-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/mc-the-miner-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-change-username-on-roblox-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_off000032dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32DD 23084 bytes
SHA-256: 3f70199c2912ac32a8d42a4b0c5b7386e51d5ed6405d0ae29ab846f3d7c420e7
font_01_sfnt_off0000669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 18168 bytes
SHA-256: 49ca197413d81a8c45b996179a8dc5f16a69a640506e408289fd8874ef63419e

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