Malicious PDF — malware analysis report

Static analysis result for SHA-256 244f2741a78b5d1b…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 03:48:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3963a8b5ce5f7ac94643c57cb5364117 SHA-1: a9dfda9aba2800cb1f247f424d0482be24994687 SHA-256: 244f2741a78b5d1bc6c6fd3bbbc9172797f06474babb8914a975f3fff904ed09
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a malicious lure, primarily through its extensive use of external links designed to resemble download opportunities for game-related cheats and hacks. The heuristic firings indicate a link farm strategy, with numerous URLs pointing to SEO-optimized PDF files hosted on external domains. The presence of a 'download button' lure further supports the malicious intent, aiming to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/hack-free-robux-no-human-verification-game-hack
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/http-blackgamesus-coinmasterhack_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-2021-spin-link-today_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/will-minecraft-ever-be-free_GM479516143.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-glitch_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-2021_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master--hack_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-coins-today_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-minecraft-mods_GM479516143.pdf
    • https://healthcare.kyst.com.tw/image/data/files/robloxhacks_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-spins-on-coin-master-app_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/hack-coin-master-free-spins_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/free-spin-link-coin-master_GM406889139.pdf
    • https://healthcare.kyst.com.tw/image/data/files/my-roblox-account-was-hacked_GM431946152.pdf
    • https://healthcare.kyst.com.tw/image/data/files/cm-free-spin-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005132.bin
820b3f1b433e62fc6a2cda7d13a272ad4a2c61478a94e762f0c892203d41480c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5132 26856 bytes
font_01_sfnt_off00008e62.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 5696 bytes
font_02_sfnt_off00009b74.bin
22c550cdeed2da13ad4077395e65b950afa4329c0a663d0ef1b8c6c5f2ac33fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B74 19028 bytes

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