Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d1e281f368ba7d…

MALICIOUS

PDF

41.8 KB Created: 2021-05-12 04:49:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b4f233e3bb354e351a0c62d3a242603f SHA-1: d046369fb1bbd11cfb71a3677b73c8fe96f36a55 SHA-256: 90d1e281f368ba7daba2e93af744543b946f352530df7e7fc3f88d435ed9f99b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and free Robux generators. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-game-hack-game-hack, which is part of a chain of redirectors leading to further malicious PDF files. This indicates a phishing or scam campaign designed to trick users into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-game-hack-game-hack In PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-spins-link-download_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_off00004948.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4948 25144 bytes
SHA-256: c49aa2478ea5c97b4c596c63f8391d65b4c2cfb238bcd1fd6e02ca2fe1ca69a8
font_01_sfnt_off0000821f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821F 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14

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