Malicious PDF — malware analysis report

Static analysis result for SHA-256 a380f4697e0beed1…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 02:26:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b1dd6e042d38e9ca62f5f751df7617a7 SHA-1: 816691af3fb5fec2a18e674415426b2d17e5d57d SHA-256: a380f4697e0beed1a64855a4ac8679515e19603686d7957fec8ec90e509abfa9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering 'free Robux' or similar game-related lures. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent, likely to drive traffic to potentially harmful sites or distribute further malware. The document body, though heavily obfuscated, contains URLs that are also listed as IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-generator-no-surveys-2021-game-hack
    • https://i-tech.ac.id/perpus/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/coolkid-roblox-hacker_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/roblox-game-free-download_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/roblox-robux-hack_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://i-tech.ac.id/perpus/repository/free-spins-coins-coin-master_GM406889139.pdf
    • https://i-tech.ac.id/perpus/repository/roblox-jailbreak-hack_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/how-to-get-vip-servers-for-free-on-roblox_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/coin-master-free-link-spin_GM406889139.pdf
    • https://i-tech.ac.id/perpus/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • https://i-tech.ac.id/perpus/repository/how-to-get-minecraft-for-free_GM479516143.pdf
    • https://i-tech.ac.id/perpus/repository/play-minecraft-online-free_GM479516143.pdf
    • https://i-tech.ac.id/perpus/repository/coin-master-links-free-spins_GM406889139.pdf
    • https://i-tech.ac.id/perpus/repository/roblox-cheat-engine-hacks-64_GM431946152.pdf
    • https://i-tech.ac.id/perpus/repository/free-robux-scam_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005064.bin
e3a625813ae7961ebe21c1b5efcaa09a4c409a0d91d212a6a645bc3e86b3eb4e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5064 25440 bytes
font_01_sfnt_off00008a96.bin
ddb002dc0b08e5dbafe4b1430e023ef39209bff6c70148c7789a0adeae43beaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A96 19044 bytes

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