Malicious PDF — malware analysis report

Static analysis result for SHA-256 d687dc4ff538df2c…

MALICIOUS

PDF

32.6 KB Created: 2021-07-20 04:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fcb9fa6c7b614b3a0649998b19d05c11 SHA-1: ada69b31b53344f81281786148b25dc52dcae7ac SHA-256: d687dc4ff538df2c49fb8821fb07f5ef85caabe38f637766730c9898fbe8e98b
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick the user into clicking a link, which leads to a download. The ML classifier strongly indicates maliciousness, and the presence of a fake CAPTCHA heuristic confirms the deceptive nature of the document. The primary IOC is the external URL used to serve the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/479516143/minecraft-font-free-game-hack
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/minecraft-free-version_GM479516143.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-tiktok-video_GM835599320.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-gift-card_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-tiktok-fans-no-verification_GM835599320.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d9c.bin
c9e44b9bff039fd7c23299551d8cacdd207b82eb9125301c0740c6cd7b25c938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9C 22324 bytes
font_01_sfnt_off00005f2f.bin
48684535abb05df1a4efb13fd94135dee175bf6b61229e4eaa41ff3ed13e5a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 17712 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.