Malicious PDF — malware analysis report

Static analysis result for SHA-256 6744f30498bd32e4…

MALICIOUS

PDF

53.5 KB Created: 2021-06-09 08:47:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 528ece917bfbe3bd5a1ae1cfeb17d5d1 SHA-1: 6c29045b51b12a1a38b36b20be75c2bbedb20af6 SHA-256: 6744f30498bd32e4a02c8ef28a700e8abd06adf324fc52b4f4c3f3650352f0b7
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, likely to trick the user into downloading a malicious file from the embedded URL. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the URL pointing to a script executor for a game, suggesting a lure for gamers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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/free-script-executor-lvl-7-roblox-5-18-game-hack PDF link annotation
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-earn-free-robux-with-proof_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-hacks-mrantifun_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000556a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x556A 28280 bytes
SHA-256: b2ba8ddd2466e3db8da4e0ab62689a57e91dea168bb5c578dcda5e3b8f54d1f4
font_01_sfnt_off00009573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off00009f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F30 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000abd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 19108 bytes
SHA-256: d4b1336cdd3ce5f81319f9c5d19ead80b1fcc005ee5e0329f411e6687aa2c95a

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