Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ba4c44d47c6e90…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 20:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4d91c7caeed7f3eeb2f93d2708f8d48f SHA-1: 2e90b9b5c287ad135600f88996906532d87f4b2a SHA-256: 73ba4c44d47c6e90915b60c6d06e1a62748f6424600896de3821b8bc25616715
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/406889139/coin-master-free-spins-hack-without-human-verification-game-hack PDF link annotation
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-tricks_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/pubg-uc-30_GM1330123889.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-download-unblocked_GM479516143.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_off0000544c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544C 24376 bytes
SHA-256: 83315bde49b9b9c194194fc3eba40662a7eedb97bd50230d66b0f6d66ed847d2
font_01_sfnt_off00008b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B85 20116 bytes
SHA-256: 4f4bd586454d0339249c4066a93da09b405a76fab4199bfe500991058b822fd7