Malicious PDF — malware analysis report

Static analysis result for SHA-256 242a9ec299c5b394…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 17:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0cc55d549368416057450ffef8860a00 SHA-1: 907d88e0c1f63317f7ebaf3b304e1cfda4b26b1a SHA-256: 242a9ec299c5b3947833e3fd556179b66525fbc02bea2e2ca7c11aea61e2471c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'free generator / game hack' theme to entice users. It contains a large number of external links, many pointing to other PDF files, forming a link farm. The primary URL, https://netcdn.xyz/app/406889139/moonactive-coin-master-free-spins-link-game-hack, appears to be a redirector for these lures. While no scripts were explicitly extracted, the PDF structure and extensive URL redirection suggest a malicious workflow aimed at driving traffic or potentially delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/moonactive-coin-master-free-spins-link-game-hack PDF link annotation
    • https://razredna-nastava.net/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-roblox-games_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
stream_003_off00004a3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3F 25004 bytes
SHA-256: 3f18b6999d9a0e8dc89a9f6e415328f64feb8cf52d849d54e53b611768a5c2ca
font_01_sfnt_off0000820c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 18168 bytes
SHA-256: 5140a57a6990af64b86c6fc328de463115c3f290c56e1373822c3feaa5dc4a97

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