Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdb9ede2ea183a4…

MALICIOUS

PDF

50.4 KB Created: 2021-06-11 09:46:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00ba24f34a6634f4e7acbcee8a2fdd7f SHA-1: 8064a3bcdc0822ae0b0bba2102660410f72af63d SHA-256: 3fdb9ede2ea183a455366318d758c3ef26465483f5c9081b60f24fb3b4a01335
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are structured as SEO-optimized links to PDF files. The document body and extracted URLs suggest a lure related to obtaining free in-game currency or game downloads, indicative of a phishing or scam campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/how-to-get-free-roblox-codes-2021-may-game-hack
    • http://elibrary.smknesbu.sch.id/repository/cm-free-spins-and-coins_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/sites-to-get-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/rbx-gg-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-how-to-get-free-robux-with-cheat-engine_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-app-real_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/hacker-day-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-new-link-free-spin_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/freespinandcoin-blogspot-com_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-fly-in-roblox-without-hacks_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/minecraft-115-2-hacks_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-grand-blox-auto-money-hack_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-pet-simulator-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e8.bin
ba7c35f04925fcd636100482fbc873df540a4e5813e5a0c6272c04f1b35199d4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E8 28048 bytes
font_01_sfnt_off000091cf.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CF 5696 bytes
font_02_sfnt_off00009ee1.bin
a9522ceb344a7abe84ef3d80cd379232e6994f815f61d05621ccf0a9522eee70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE1 19396 bytes

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