Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ea7ccf5aa6fd99…

MALICIOUS

PDF

48.6 KB Created: 2021-06-11 07:29:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: be6d21698ef0796fa86841261b94a7ad SHA-1: cb7b695eee1c0f1047e5e711efdc57c28e81f230 SHA-256: a9ea7ccf5aa6fd99042349f46448f10f82ffa26af3222b8fab5ccfc5fef8b7fc
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various game-related hack guides. The primary URL, https://netcdn.tw/app/431946152/hacking-laurenzside-roblox-game-hack, suggests a lure for users seeking cheats or exploits. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of linked PDFs indicates a likely attempt to drive traffic to malicious or misleading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/hacking-laurenzside-roblox-game-hack PDF link annotation
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-roblox-shinobi-life_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hacks-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000520b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520B 25384 bytes
SHA-256: 0ad0672f6258b480f0e597b7d4aa31d404566e7a67754ce2c8178f64dd0ebb66
font_01_sfnt_off00008c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C76 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000991e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x991E 18984 bytes
SHA-256: f18426e1ef34d1c21507a7fca502fca8e76d785ce13487d90c0cec4ca8a14ff3

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