Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a5d0b2545831f8…

MALICIOUS

PDF

34.3 KB Created: 2021-06-26 16:38:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0bfdebeee270e68ed4b0ed7096581d58 SHA-1: 8b891f7822c638b19984062a57ad62dbd782c89c SHA-256: 67a5d0b2545831f8227ad5f4b6a00b165caad74fef7d5ea951624196206ea11b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a game hack and free Robux lure to entice users to click on external links. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the numerous extracted URLs pointing to similar content indicate a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed, suggests potential for further malicious actions like downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/roblox-bubblegum-simulator-cheats-2021-game-hack PDF link annotation
    • https://opac.itp.ac.id/repository/roblox-free-robux-code-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-apps-that-work-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-roblox-players-on-ipad_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-100k-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/good-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-keywords_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-giver-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/rbx-earn_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-advertise-your-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-mod-apk-2021-download_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
font_00_sfnt_off00002ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDD 22188 bytes
SHA-256: 881163521654ed04c1c4b089c353ec5ab89f3368c152be187df7a273b5376962
font_01_sfnt_off00005f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F10 19676 bytes
SHA-256: f0665055217988c551aa0dc017fb8ffc4bbd735acf0042b6dbab9d0253ef10f9

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