Malicious PDF — malware analysis report

Static analysis result for SHA-256 8137fca6abe7579d…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 06:18:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a4c13cb945d47b7edd3c77a21d740a30 SHA-1: 493ce49872876fb39ab76fd45a6be8d7b0f23068 SHA-256: 8137fca6abe7579df83e01e457757c2c2e785517832aa1550d68a088cd4cd381
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and game hack lures, designed to trick users into visiting potentially harmful websites. The primary lure is a 'Coin Master Unlimited Spins' generator, which redirects to http://netcdn.tw/app/406889139/coin-master-unlimited-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-unlimited-spins-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/hack-script-roblox-game-servers_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/hex-number-gives-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-into-a-roblox-accont_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/make-robux-free_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/robux-hack-2021-november_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-2021-site-youtubecom_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/robux-free-real-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/pastebincom-raw-uf8dgrtm-free-robux-android_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-money-cheat-no-download_GM431946152.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
font_00_sfnt_off000030a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A2 22540 bytes
SHA-256: 4a956870291d8d47fc30419a39da5e6257e3a322c0781c90239f98ecd505e918
font_01_sfnt_off000062fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 18704 bytes
SHA-256: 2e8c7de27f3ba86e55e5e355ae95bc495c43d663aeff332330d22d9f8881b6ba

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