Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d8534814bb61f1…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 14:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6a05e695bd5a6668196a5ffebde5636e SHA-1: 391b6d94bd368e0a40b2199760ec4ccfe83e4a5e SHA-256: 76d8534814bb61f1f2ed6e293b17bec9c8793651a78852491a210860fe87cc6f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a specific external URI, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading potentially harmful content. No scripts were extracted, but the extensive link farm points towards 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.tw/app/431946152/how-to-hack-robux-game-hack
    • https://perpus.upp.ac.id/digilib/repository/coin-master-daily-spin-free_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/daily-free-spins-coin-master_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/roblox-free-ninja-animation-pack_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://perpus.upp.ac.id/digilib/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://perpus.upp.ac.id/digilib/repository/coin-master-100-spin_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/free-robux-apk_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/dragon-ball-fury-roblox-hack_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/best-free-roblox-executor_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/free-robux-generator_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/how-to-be-a-creeper-on-roblox-for-free_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/free-robux-hack-not-fake_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/coin-master-fan_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/rbx-roblox-robux_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://perpus.upp.ac.id/digilib/repository/free-spins-coin-master-2021_GM406889139.pdf
    • https://perpus.upp.ac.id/digilib/repository/links-for-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003237.bin
f99476b17fd9fd3d0144fbb2bd4b6e191823451b8d658a45a40f53110205809f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3237 22580 bytes
font_01_sfnt_off000064d0.bin
eabb09a914750731f64ad11a0b688188fe1798403d7ade495959fd69a4976413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D0 18884 bytes

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