Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ea40b64a9ea03…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 04:17:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5a38f90f34f69120f939a320ae5bb350 SHA-1: ce92a4860601cfaec873d9dc10a341dfae24dbe4 SHA-256: 869ea40b64a9ea03f65f7d7143bfc560a8522e17853d1bb276ab7440130a5147
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious websites. The document body and embedded links, such as 'https://netcdn.tw/app/431946152/free-acounys-for-roblox-game-hack', indicate a lure related to game cheats or free items, a common tactic for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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-acounys-for-roblox-game-hack
    • http://e-pustaka.stkipadzkia.ac.id/repository/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/get-free-spins-coin-master_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/roblox-how-to-get-unlimited-free-robox-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-daily-spins-from-coin-master_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/hack-avatar_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-money-in-jailbreak-roblox-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-download-minecraft-hacks_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-hack-a-roblox-account-april-2021_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/minecraft-pe-free-download_GM479516143.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-roblox-account-generator_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/cm-free-spin-link-today_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/master-coin-free-link_GM406889139.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • http://e-pustaka.stkipadzkia.ac.id/repository/free-promo-codes-roblox_GM431946152.pdf
    • https://collectrobux
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005125.bin
19c6a475ee07029ff2fd791282c7420b84fd32c72a248c6a907c92c885071783		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5125 25516 bytes
font_01_sfnt_off00008c39.bin
aae223541ec77cc3e130db88f4129ed8915eada9f49c251f997c71689e7ab821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C39 18268 bytes

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