Malicious PDF — malware analysis report

Static analysis result for SHA-256 21613ec307bfceb4…

MALICIOUS

PDF

34.0 KB Created: 2021-07-07 21:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 679c2ed4fe5a1fc24844e253815ff1f9 SHA-1: 862a0501e1551bc23e1fccd9810aa7c25aa04220 SHA-256: 21613ec307bfceb49c919794f74f128eec640438faca2ebdd5fc4f52a07716f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector, that promise free game currency or hacks. The primary lure is 'Free Robux Now', directing users to 'http://netcdn.tw/app/431946152/free-robux-now-game-hack'. This indicates a phishing or scam attempt designed to lead users to potentially harmful websites.

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/431946152/free-robux-now-game-hack In PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/wwwrobloxcom-games-for-free_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/arsenal-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/jetpack-simulator-hack-script-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-to-get-free-robux-on-samsung-phone_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/roblox-hacked-places-free-download_GM431946152.pdfIn PDF document text
    • http://www.vpn-solutions.com.pe/ckfinder/userfiles/files/how-do-you-get-free-robux-2021_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_off00002fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAE 21996 bytes
SHA-256: d99416a944b9f00d957d18d4db7c031733a40e0b0157c8e4e385d3ee82da6cf7
font_01_sfnt_off00006066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6066 18880 bytes
SHA-256: 5812b0d0ccf9dc87c8d54428ef2763728ec286cf096b79da6b6c7cfb1f79e008

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