Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3b1a659de7227c…

MALICIOUS

PDF

46.3 KB Created: 2021-06-04 02:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a41a05e574b3909bc1a23919474c86e1 SHA-1: d2bcaabb189effcdbc6ea4a42df94c0f13279d85 SHA-256: dc3b1a659de7227ca42ba628eac23116f785cef65f4ebc64985da849c5b230e6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA lure to deceive users into downloading a payload from the embedded URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests a download attempt. While no scripts were explicitly extracted, the document's structure and heuristics point towards a social engineering attack designed to facilitate the execution of a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/free-roblox-accounts-generator-game-hack
    • http://libsmpn1balongpo.sch.id//repository/pokemon-go-free-gift_GM1094591345.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/mcpe-hacks_GM479516143.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-roblox-generator_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-100-robux_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-card-collection-in-coin-master_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-2021-link_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/roblox-free-robux-website_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/coin-master-2021-free-spins_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id/repository/roblox-hacks-2021_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/actual-free-robux_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/como-descargar-coin-master-hackeado_GM406889139.pdf
    • http://libsmpn1balongpo.sch.id//repository/apps-that-give-you-free-robux_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-robux-hacker-us_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/free-printable-roblox-coloring-pages_GM431946152.pdf
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f1e.bin
b8b04ecb5f14d3646ea60f1f26e89d45846ba5048c3f690918feb94fa1bc6d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1E 30132 bytes
font_01_sfnt_off0000922c.bin
53882506a585ec055cfd1b3dca4ddad0c6693ab294b081b26afef1ed42434664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922C 18420 bytes

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