Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b369081d9c7e2d…

MALICIOUS

PDF

35.8 KB Created: 2021-06-18 14:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7b13ef7cb22cfc8e2b0ba7bf6d5d8299 SHA-1: a4ad154580f24142fa49e0fa5da38b5b613dd0b0 SHA-256: c9b369081d9c7e2d4c64fe5247a2693702a5226ca692b9c3058c63bd0a288ad5
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, masquerading as game hacks and generators for popular games like Roblox and Coin Master. One prominent link, http://netcdn.co/app/431946152/free-roblox-blue-hair-com-game-hack, is identified as a malicious redirector and impersonates the Microsoft brand. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.co/app/431946152/free-roblox-blue-hair-com-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 http://netcdn.co/app/431946152/free-roblox-blue-hair-com-game-hack In PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/roblox-anti-anti-cheat_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/roblox-girl_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/groups-that-give-free-robux-everyday_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/roblox-hack-review_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://lamgiangservice.com/ckfinder/userfiles/files/www-coinmaster-com_GM406889139.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_002_off000032f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F0 23176 bytes
SHA-256: 68722dc29a76ec89a0463076f2895f0ab932fa50c7c41bd84d943c6800cf1bcf
font_01_sfnt_off000066bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BC 19168 bytes
SHA-256: 01c23b8d6c37dbc6e48e99443ee3afd23af0343cf33f5ba20b340ae23e7e9ff3