Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b6008655d7e8cc…

MALICIOUS

PDF

35.6 KB Created: 2021-06-18 08:02:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c19f456cb77218c96f20f679adb44ab7 SHA-1: 3695783405bb95f5e2dc4925b20b3907d3a80765 SHA-256: 52b6008655d7e8cc6a626bb227cda39cf4160e2cbcf8da71d70c7410ca08adf3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users with promises of game hacks and free currency, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful websites.

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-prison-escape-hack-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/como-hackear-roblox-para-tener-robux-facil_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-roblox-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cheat-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earn-robux-by-watching-ads_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_off0000328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328E 22988 bytes
SHA-256: 85d91270d25d5f1abad44ad9881278e68403677c463a6097f005088ce1e2f979
font_01_sfnt_off00006629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6629 19104 bytes
SHA-256: f6406c64d617022dcadbeb8afded8a6ff8070b3e834d717354b169491d9fd954

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