Malicious PDF — malware analysis report

Static analysis result for SHA-256 60aff2bd574bb312…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 03:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 71bad03ea7d5fa0ee32f4f38974516f5 SHA-1: e04ee41cf1c2ce0b33064b3cd10ff6a29aab69f4 SHA-256: 60aff2bd574bb312a7e00ad9fc2c01110601bfbf822c2d06cdf9b9b7ab52cbd6
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking malicious links. It also functions as a link farm, directing users to numerous other PDF documents hosted on external domains, likely for SEO manipulation or further phishing attempts. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coin-master-free-spins-link-download-apk-game-hack
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-jailbreak-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/apps-for-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-do-you-get-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-cheat-codes-free_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdf
    • http://perpustakaan.pa-jember.go.id/repository/lazyblox-com-free-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/roblox-rape-hack_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-realms-free-codes_GM479516143.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-gifts_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-earn-robux-by-playing-games_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/master-free-spin-and-coin-link_GM406889139.pdf
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-today_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a9b.bin
1816d4680c88699ed0c3f27cdfefe24b7065a7d8a64f83cb8f47a33a1e3038cb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9B 26100 bytes
font_01_sfnt_off000086f5.bin
25357440b967022afdda2762c117e199fe34607d55555ae4de3c7ac45df8a0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F5 18636 bytes

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