Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2a71a4e31cf89b…

MALICIOUS

PDF

36.5 KB Created: 2021-06-25 22:53:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5ed25aacb5be80fba5351c0463aa145b SHA-1: ca07190cbe97d28d28b05ea381b57443e892b1e8 SHA-256: fc2a71a4e31cf89bf0f5a2ae040bae0de5b1207deaddab5d52d66937e3f68ceb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary malicious link identified is http://netcdn.co/app/431946152/www-roblox-com-cheat-in-no-survey-game-hack, which is flagged as a known malicious redirector. The document's content and heuristics suggest a social engineering lure to trick users into downloading or visiting malicious sites, likely as a first stage for further compromise.

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.co/app/431946152/www-roblox-com-cheat-in-no-survey-game-hack In PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-roblox-exploits-that-supports-loadstrings_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/download-roblox-for-free-on-android_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/cheat-engine-max-health-roblox_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_off00003474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3474 22816 bytes
SHA-256: b58d4b378ce4d8b8ee16fe6dec925c35c02b08f10fc5d73f2515a931f824893a
font_01_sfnt_off0000679f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679F 19812 bytes
SHA-256: 3e80740bc1cda81ecaa2e16a1caa5f405157058e636ec8cf9e90835fdc7a8fa8

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