Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc31e8543a4bfe…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 08:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f9d6c0c2da5e4c306a5cc10c9f88ff0d SHA-1: 30fb0e36abd2b9c13e9912f962a0c064c33cb9ab SHA-256: a3fc31e8543a4bfe974484b15f45b7b125e3a3722afab00356d5e1f22de891ff
200 Risk Score

Malware Insights

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

This PDF document contains multiple heuristics indicating malicious intent, including a critical finding for a redirector link and brand impersonation (Netflix) to lure users. The embedded URL, https://netcdn.tw/app/431946152/robux-script-hack-2021-suffi-de-s-abonner-plus-script-game-hack, is associated with game hack lures and likely leads to credential harvesting or a secondary payload. No scripts were extracted, but the PDF structure and embedded links strongly suggest an attempt to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/robux-script-hack-2021-suffi-de-s-abonner-plus-script-game-hack.
  • 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/robux-script-hack-2021-suffi-de-s-abonner-plus-script-game-hack In PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/best-free-roblox-strategy-games_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-cheats-mac_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-jailbreak-hack-download_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
stream_004_off00005476.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5476 24244 bytes
SHA-256: 24a7d6e0379ea9e0b068cc4e013479a9903a7b384876b0d48e8474efe3392cf0
font_01_sfnt_off00008bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEC 19444 bytes
SHA-256: a8dc15145bed39c029db6411cda19e8765e758b5c5072eb1efdc0bf3feb72fc6

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