Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b9185014633fbb…

MALICIOUS

PDF

45.0 KB Created: 2021-06-04 05:13:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b841a92829bb8b8d04bbaf6062564ad5 SHA-1: 4f82723e3cf520a79590d14bb22e5f46c11d5b12 SHA-256: 42b9185014633fbb13a25b22239ef9954981832d5143025a58dbcefee7568f29
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites offering game hacks and free in-game currency, such as 'coin-master-hack-apk-july-2021-game-hack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with deceptive lures. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-hack-apk-july-2021-game-hack PDF link annotation
    • http://pustakafpsi.uin-suska.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustakafpsi.uin-suska.ac.id/repository/free-coin-master-spins-for-today_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
stream_004_off00005232.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5232 25052 bytes
SHA-256: 96f07efb66562eeb17498ad07fc4f2ce5107959c5ca13d8bc0154d7cf8611586
font_01_sfnt_off00008b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B80 18856 bytes
SHA-256: e99766a1a0b67468f3491ceb7ac95e225ca21799f54ecffa1d342ccadf1fb563

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