Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca2d5879bbefe77…

MALICIOUS

PDF

33.5 KB Created: 2021-06-25 13:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f7d53fd8d7c2ab374fb4caf3ced938c2 SHA-1: cb97248ed0fc6119a1022f3b140aa6739b7f3933 SHA-256: aca2d5879bbefe77ec66d743950d954053929f42b1529fd638b87baa46521f4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links and a lure related to game hacks and free in-game currency, strongly suggesting a social engineering tactic to trick users into downloading malware. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the initial redirector URL which likely leads to the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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/free-recording-roblox-software-game-hack PDF link annotation
    • http://perpustakaan.iahntp.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/lemon-aid-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-by-joining-a-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/why-you-shouldnt-trust-free-robux-scams_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/hack-spray-paint-roblox-libary_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/fre-roblox-gift-code_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/hacked-by-john-doe-roblox-prank_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-aimbot-free-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/hack-roblox-electric-state_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-roblox-item-code_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_001_off00002b05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B05 22688 bytes
SHA-256: b1687f4cf57b30c1e57ec939e6c10a1235b8153c14673c6db2a6a43d7a9a348e
font_01_sfnt_off00005d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D93 19212 bytes
SHA-256: b21b97481ac2c4ac4f62ac16df2cec3675100b2e4af5454111d38339ea01d382

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