Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99a4e5ebd703a5a…

MALICIOUS

PDF

53.1 KB Created: 2021-06-10 16:05:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a3a7b91ce771397eff8b5e9ea4b545d4 SHA-1: 5917598c97d399b0b5026674b5cf53ed398da56a SHA-256: e99a4e5ebd703a5a7f2055333bf1f44c2cf01339976376383b0982991651b9f4
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with a malicious link. This is a common social engineering tactic to encourage the download of further malware. The embedded URL and numerous other related URLs suggest a campaign focused on distributing game-related cheats or hacks, which often serve as a lure for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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.tw/app/431946152/v3rmillion-robux-hack-game-hack PDF link annotation
    • http://akvamaster.com.ua/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/2021-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/roblox-hack_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/roblox-free-gear-codes_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://akvamaster.com.ua/images/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://akvamaster.com.ua/images/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://akvamaster.com.ua/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AD 25348 bytes
SHA-256: 5f9abc30a12d6a6b0924b877806303734e53f55ba7b551c7fb71f192e3dfea68
font_01_sfnt_off00008c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C98 9484 bytes
SHA-256: 900620c43ad84df90bf9c1e09735684964321604bd3d41ea77da3976aa88129b
font_02_sfnt_off0000ab39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB39 19008 bytes
SHA-256: 4212db8c42785d1b408de6542654421d21c01a22dafb3b6855c489a06c15f858

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