Malicious PDF — malware analysis report

Static analysis result for SHA-256 755e131b7fef0a2a…

MALICIOUS

PDF

33.3 KB Created: 2021-07-01 07:26:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7e95175f90c00c1da78b13735aeef6db SHA-1: 5a6424e1a106137cd3f25e0bd311c1f7a55e6849 SHA-256: 755e131b7fef0a2a72dd839c5d717b230df16e1a5e346ed47e851d836bf2d300
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on elib.upiyptk.ac.id and appear to be part of a link farm designed to attract users searching for game cheats and free in-game items. The presence of a direct download URL and the ML classifier's high confidence score indicate a malicious intent to deliver a payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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.co/app/431946152/rbx-center-free-robux-game-hack
    • http://elib.upiyptk.ac.id/opac/repository/infinite-robux_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/2021-free-spins-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/roblox-lumber-simulator-2-hack-script_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/roblox-how-to-get-free-clothes-on-ipad_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/roblox-games-with-free-radio_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-card-link-today_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-pocket-edition-free-ios_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac/repository/fre-robux-genorator-download_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/apocalypse-rising-roblox-hack-script_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-gift-card-codes_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/comment-cheat-sur-roblox-retail-tycoon_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-apk-free-download_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/robux-hack-no-human-verification-no-survey-2021_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/cheat-roblox-dongeon-quest-installer_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-games-download-free_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/the-society-of-magic-roblox-hack_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/get-free-tiktok-followers_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d66.bin
01fe3e4bacc41b5a1d26b7d435c14233dc68e0c3ebf7459010ae9c9c8a9ee1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D66 21820 bytes
font_01_sfnt_off00005d8e.bin
5aa00de4e1ddf310143140f6d298e0e40188410dcb25e63c927598621da0c1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 18820 bytes

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