Malicious PDF — malware analysis report

Static analysis result for SHA-256 256747b3b66b917c…

MALICIOUS

PDF

51.6 KB Created: 2021-05-14 06:39:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b4b47fd7acca7e4cb3f8231f8a55fe2a SHA-1: c83a66891b96df04af842f8f8441dfecfb34317d SHA-256: 256747b3b66b917c400f87fd40b2634a67c15ef7889754d221289a03442cbee5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a fake CAPTCHA lure, indicating an attempt to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious. The primary URL, https://netcdn.xyz/app/431946152/robux-no-human-verification-2021-game-hack, is likely the destination for the fake CAPTCHA, aiming to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/robux-no-human-verification-2021-game-hack
    • https://trustindoutama.com/assets/CKImages/files/link-coin-master_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/websites-that-give-free-robux_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/hack-minecraft_GM479516143.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-coin-master-spins_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/coin-master-hack-activegamer_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/microsoft-free-robux_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/roblox-redeem-card-codes-free_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/roblox-free-robux-codes_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/minecraft-hacks-xbox_GM479516143.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-robux-co_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-shields-coin-master_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/games-to-get-free-robux_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-coin-spin-coin-master_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/robux-com-free_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-coins-for-coin-master_GM406889139.pdf
    • https://trustindoutama.com/assets/CKImages/files/free-back-accessories-roblox_GM431946152.pdf
    • https://trustindoutama.com/assets/CKImages/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004dde.bin
9adb70d1cf4f6da1203bfd8e4d2d8ebd7f94c32f7422e264b8bdafb01e22cb2a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDE 27076 bytes
font_01_sfnt_off00008ccd.bin
0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 7420 bytes
font_02_sfnt_off0000a53c.bin
cb8809738aabb1441b1427e812c482b7c8f50740efdb0db68f9cd49fa431659e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA53C 19100 bytes