Malicious PDF — malware analysis report

Static analysis result for SHA-256 1796a27378c8cae5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 13:52:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8e0b85ddaddbaf773fb32d4c3b18d051 SHA-1: dee7bc20b08ec052bc43615fdf104a14f20a15e9 SHA-256: 1796a27378c8cae5dec021d9b7174558474eedbeb893b6766c38d175f91e793e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file employs a common lure of free game items and hacks to entice users. It contains numerous external links, including a primary redirector at http://netcdn.tw/app/479516143/minecraft-free-computer-game-game-hack, and a large number of SEO-optimized PDF links hosted on perpustakaan.poltekom.ac.id. This structure suggests a link farm or a distribution mechanism for further malicious content, likely involving exploitation of PDF vulnerabilities.

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.tw/app/479516143/minecraft-free-computer-game-game-hack PDF link annotation
    • http://perpustakaan.poltekom.ac.id/repository/roblox-hack-cheat-engine-65-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/actually-free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/hack-and-slash-roblox-ghostemane_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-that-i-can-play-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/gift-roblox-com-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/www-roblox-com-cheat-in-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-roblox-accounts-with-lots-of-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/furky-roblox-hacks_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_off000032e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E1 22576 bytes
SHA-256: ff5f9766b2c51ff51cfc89b42e68191c47fe457f257da5011398b37a566b9375
font_01_sfnt_off000064e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 18576 bytes
SHA-256: c3858ab9c93ee0d54086a54cbca57519016d4b26ff41f14ee4df921336ab6e95

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