Malicious PDF — malware analysis report

Static analysis result for SHA-256 638813ebe779ae41…

MALICIOUS

PDF

34.0 KB Created: 2021-06-20 12:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c7b777fb045a994e14111394a8c9fd3 SHA-1: 54cd4e798f343120d45fcf7a600f5d91d3c6932d SHA-256: 638813ebe779ae4153f38c425cbb09c8aaec8b0d3eeb683d73b946074e80bf46
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.co/app/431946152/pastebin-hack-robux-2021-game-hack. This lure, combined with the 'password-protected archive handoff' heuristic, suggests the document is designed to trick users into downloading or accessing a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/pastebin-hack-robux-2021-game-hack PDF link annotation
    • https://library.elkatarie.ac.id/repository/roblox-rocitizens-codes-for-free-items_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-look-like-a-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/using-cheat-engine-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hack-cuentas-gratis-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-roblox-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-gojirasaurus-free-ancient-earth-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/i-want-to-break-free-roblox-versin_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/rocash-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-someones-password-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/ad-why-cant-have-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-apocalypse-rising-dll-hack-downlaod_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.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_off00002ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED2 21764 bytes
SHA-256: 1d06eb315259b7fbf831c12303b2b00dddb0fdd5b3e1aeb674f7b2130de00a37
font_01_sfnt_off00005e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E75 19504 bytes
SHA-256: 7c588a631b0792a22c3f696610601ea770b40e6028d03267388d9cec1ff7b87f

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