Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c03855b6e79c2f…

MALICIOUS

PDF

47.0 KB Created: 2021-06-09 06:10:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca6c0f63de3b5e1389e2cb8943011451 SHA-1: dd826dd0e2636589670debda3d02718f07cef84d SHA-256: 89c03855b6e79c2f181640ffca042b833cacb33b3f2b36424a32a8e391f91a86
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of offering free Robux to trick users into downloading a malicious file. The presence of an external URI pointing to a 'free-robux-generator' and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains references to the lure and the malicious URL, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-robux-generator-no-download-no-surveys-2021-game-hack PDF link annotation
    • http://library.poltekkes-palangkaraya.ac.id/repository/pubg-uc-qiymtlri_GM1330123889.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-roblox-code-redeem_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/how-often-pubg-uc-paid_GM1330123889.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/roblox-hack-account-download_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B5 27212 bytes
SHA-256: 3d3e9816d785751b6c392e72cba4e2634899c162e7f36e7746fdb284cc0878f9
font_01_sfnt_off000090ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90EE 19624 bytes
SHA-256: ad8c1c0c0f1e6f0a779532cfaaa371d1243b551e1429b72d96d79e8f946245b9

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