Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cfa27b3f83704e…

MALICIOUS

PDF

34.0 KB Created: 2021-06-18 05:32:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fffb5092e666f2795a441b8835c1795e SHA-1: 09528ce7e69d7b92f0640dc8cf4dee0837f06597 SHA-256: f2cfa27b3f83704eb02a0e4fc5178b22bd803c472ed427754fe124709ec44e74
168 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body and heuristics indicate a lure related to free game items, specifically directing users to 'http://netcdn.co/app/431946152/free-roblox-gun-gsmes-game-hack'. This link is known to lead to malicious infrastructure, likely to download a second-stage payload or redirect to a phishing site. The embedded JavaScript is likely used to facilitate this redirection or exploit.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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-gun-gsmes-game-hack In PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-generator-no-offers_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/fortnite-skins-free-for-roblox_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-see-chegg-answers-free-tiktok_GM835599320.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-cheat_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-free-robux-inspect-element_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9D 22352 bytes
SHA-256: 6ea0b8fe24fc91dd8970118023df5427ec7aab50f3a652120379e25ffff5a3f3
font_01_sfnt_off0000605e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605E 18864 bytes
SHA-256: 5930eeb88ebe593013279b8346d5ec4d0e44e51128de54096659b8d6e9366bf5

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