Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fb66275ae8544d…

MALICIOUS

PDF

49.8 KB Created: 2021-05-12 23:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 878ee3d471f0f90f8e0675a543cf83df SHA-1: 0b82ef8da125377e8dff03b3c04116cd1d02208d SHA-256: b6fb66275ae8544dc5c105aa6e54dc49a477580fe191ea630569071df3b21390
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' which redirects to a suspicious URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests the document is designed to lead the user to a potentially harmful site. No scripts were extracted, but the document's structure and embedded links point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/431946152/how-to-get-free-robux-app-game-hack PDF link annotation
    • https://infopromosusu.id/ckfinder/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/robux-games_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://infopromosusu.id/ckfinder/userfiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004df1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF1 37480 bytes
SHA-256: 9e7e3478532728ffd44e30a885c0fc9a769b0d22ee06d1b156b6071286ffc43e
font_01_sfnt_off0000a033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA033 18460 bytes
SHA-256: 9b29575604d2c2a5900261a35c88052e604744084870fcd9fc708b4f32deccf1

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