Malicious PDF — malware analysis report

Static analysis result for SHA-256 2440262b3cec16e1…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 21:55:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5f847045f1ea87cc5c194daffefbba0b SHA-1: 6a766a3363a66901c9a6423748b965551f202926 SHA-256: 2440262b3cec16e10f5a61f2f33b843e051dcc1b6dd1ca9220b4d2d187ff22fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The document body, though heavily obfuscated, contains references to hacking and game currency, suggesting a lure for potentially malicious content or scams. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates a high likelihood of redirection to harmful sites.

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-hack-to-get-roblox-money-game-hack
    • https://perpustakaan.itda.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/best-free-coin-master-spins_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • https://perpustakaan.itda.ac.id/repository/minecraft-tower-defense-hacked_GM479516143.pdf
    • https://perpustakaan.itda.ac.id/repository/free-minecraft-texture-packs-java_GM479516143.pdf
    • https://perpustakaan.itda.ac.id/repository/games-like-coin-master-for-free_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdf
    • https://perpustakaan.itda.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdf
    • https://perpustakaan.itda.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/robux-free-online_GM431946152.pdf
    • https://perpustakaan.itda.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/sites-to-get-free-robux_GM431946152.pdf
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-robux-no-verify_GM431946152.pdf
    • https://perpustakaan.itda.ac.id/repository/free-spins-coin-master-march-2021_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/20210-free-spin-links-for-coin-master_GM406889139.pdf
    • https://perpustakaan.itda.ac.id/repository/minecraft-pe-free_GM479516143.pdf
    • https://perpustakaan.itda.ac.id/repository/roblox-adopt-me-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005014.bin
a4654389c8e1292b70facf645030946e25a15bc1769ab35d130985df86b15929		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5014 26072 bytes
font_01_sfnt_off00008caf.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAF 2820 bytes
font_02_sfnt_off0000964f.bin
13150ed4410de26c1c446e9b3b3223ccf716adc548a1c8b25ac9aa9d1b1ddb49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964F 18828 bytes

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