Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bfbbd219f26dbe…

MALICIOUS

PDF

32.7 KB Created: 2021-06-30 06:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5d9f0b14764a9bc71d4ebd06f9712b8f SHA-1: dcc91ccda859627a769f488c07da85d59ed50e6e SHA-256: a5bfbbd219f26dbec7bfac32269ef30f8056c53427036bfaad35b50e05273469
102 Risk Score

Malware Insights

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

The PDF document contains a high number of external links, many of which point to SEO-optimized PDF files on a university repository, suggesting a link farm or SEO manipulation tactic. The primary URL, http://netcdn.co/app/431946152/free-roblox-username-changer-game-hack, combined with the document body's lure of "Free Roblox Username Changer", indicates a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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-roblox-username-changer-game-hack PDF link annotation
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-robux-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/pokemon-go-free-100-iv_GM1094591345.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-roblox-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-robux-gift-card-codes-2021-december_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/artificial-intelligence-roblox-hack-streets-void_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/greg-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/roblox-counter-blox-roblox-offensive-hacks-very-op_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-do-i-get-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/auto-kill-hack-roblox-assassin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/robux-star-code-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stiq-amuntai.ac.id/repository/how-to-get-free-robux-2021-november_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_off00002b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B70 21700 bytes
SHA-256: a52a8b5af0a4a72a5291dfc2d27f4b3299011f354c8efda481fd852e51f2486a
font_01_sfnt_off00005aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEC 19076 bytes
SHA-256: f0424a4f630e2721e9c5c6c4edb903c9ab9c4a6461aec427fcd71f09cd49b080

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