Malicious PDF — malware analysis report

Static analysis result for SHA-256 4233628de7f94e04…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 04:42:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 55d9e8d1af574ca3ae542abd175cb173 SHA-1: a41075e4f19670c155de6b528ab62fb60f1a83ff SHA-256: 4233628de7f94e04f283285b1cc2d45b64ded4c3e48de7060fa63e7d665f5c82
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on domains related to 'digilib.stimlog.ac.id' and 'netcdn.tw'. These links are presented as resources for game cheats and hacks, indicating a social engineering lure. The presence of a large number of external links and the ML classifier's high confidence score suggest this PDF is part of a link farm or phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/coin-master-spin-hack-trick-game-hack
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/install-free-game-coin-master_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-fly-hack-in-roblox-prison-life_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/what-is-a-minecraft-client_GM479516143.pdf
    • https://digilib.stimlog.ac.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/free-vip-server-roblox-mad-city_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-bloxburg-beta-free_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-dungeon-quest_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/generator-robux-free-download_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/a-game-were-you-can-get-free-robux-roblox_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-how-to-enter-cheat-codes_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-melissa_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-how-to-create-a-group-for-free_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-lumber-tycoon-2-cheat-engine-tutorial_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/free-roblox-school_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-hack-into-roblox-and-get-robux_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/robux-cheat-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003248.bin
b9b54dfb78ddc370581da3d4451392f71fcbbcb1dedfa1d112a7f24ee118db7d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3248 23324 bytes
font_01_sfnt_off00006711.bin
3cba103f46251083c6108153a5c13e256b50276802e704cd2e69df14854b554c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6711 18180 bytes

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