Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d24731ec14880e…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 20:10:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd855ddec7bd81862339ecd274bb5062 SHA-1: 5593a0cf9c4f9abfb158a01d390fe7091d1087b5 SHA-256: 54d24731ec14880e3ad8c2f61be723cbfc4304216f2540c83347fb113f2f510e
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. The presence of multiple URLs, including one pointing to 'robux-free-promo-codes-game-hack', suggests a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/robux-free-promo-codes-game-hack
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-generator-for-kids_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-minecraft-com_GM479516143.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-not-a-scam_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/fbchampion-com_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-game-hacking-tricks_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-free-coins-no-human-verification_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-script_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/robux-robux_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coinmaster-spin-ml-free_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-no-offers_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-accessories-roblox_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-apk_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-minecraft-domain_GM479516143.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-with-no-verification_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d4.bin
12cbeac5809b2091097b63b8f6819985885313a0c5a9128f1c64da0d3cea77a4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 25040 bytes
font_01_sfnt_off00008352.bin
72370e69d4b3437de95b76ada03da26e1fdb3d0ee534a059885e6f785b63064d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8352 18604 bytes

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