Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41f398f4b0c28f9…

MALICIOUS

PDF

46.2 KB Created: 2021-06-04 01:28:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 933bb11c53c98a3d9a85a68ce98d604b SHA-1: cbeda27b3d0f42916636a4e8615ccc190ee88c47 SHA-256: e41f398f4b0c28f983adb6cb5d0e4c7c9bf518b1c4758f6f32e0e21351161356
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering free game currency or hacks. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful files. The primary URL associated with the lure is https://netcdn.online/app/431946152/free-robux-no-verification-or-survey-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/free-robux-no-verification-or-survey-game-hack
    • http://perpus.stmik-im.ac.id/repository/buy-robux-free_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/roblox-hax_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/what-games-give-you-robux_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/rbx-place-free-robux_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/free-robux-no-verification-required_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/hack-coin-master-apk-mod_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/free-robux-kid-friendly_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/free-robux-real-working_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005045.bin
cce27bb183100d201693859835b67fc96bfb64c2cccd366f0e0cb2722487a028		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5045 27848 bytes
font_01_sfnt_off0000902b.bin
85e8471d4bb7809b16494b43ecc998cec7f87bafeaec38a3001510264e72f0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x902B 18892 bytes

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