Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b0b38dc9bffd73…

MALICIOUS

PDF

39.8 KB Created: 2021-05-10 13:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1f28062405fe9e7865587b4317f9f574 SHA-1: 9f20f4c1543b4642ca75bc8650a5ca5cd50fded2 SHA-256: b8b0b38dc9bffd73f05634e981edc5c3696458e82dd9255d42d748acd7d01de3
90 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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/free-old-roblox-accounts-game-hack PDF link annotation
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/fb-coin-master-hack_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_off00003ec9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EC9 25452 bytes
SHA-256: 181dbb66f1b02d3f96fd2db280eba1c739bc541b62c8ad37221e0addfac055d5
font_01_sfnt_off0000798c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798C 18368 bytes
SHA-256: ba2f6d3da4eaca6d1fdd270dc574262566f59b0810be26bac781a581096b393b

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