Malicious PDF — malware analysis report

Static analysis result for SHA-256 7979552f44dc6f66…

MALICIOUS

PDF

41.5 KB Created: 2021-05-13 17:56:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f2c74a23b51a3171fda03300cd807dfd SHA-1: d8a4c39bc5409c666e7ff16d90709773756ca98f SHA-256: 7979552f44dc6f6626c5c9435226386901b9c56523182838efee6d6fb2afe779
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 0.9971

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.xyz/app/406889139/coin-master-hack-generator-game-hack PDF link annotation
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/mc-update_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-game-free_GM406889139.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_003_off000048aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AA 25180 bytes
SHA-256: 97586f457259e14cfa110153b7cfe982976633713c48c23c05d7fc80845135e1
font_01_sfnt_off00008183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 17716 bytes
SHA-256: b5038ced4ab316a7f74842444eb7c28ee9c11b1798bcdca0ea22787b41e5f9ea

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