Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd963e3fc04653ef…

MALICIOUS

PDF

32.7 KB Created: 2021-06-27 03:38:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbc719059d3b403d53246a8e3be97c60 SHA-1: 1697f31d19b19ff3b23bd38de24368b9dcad058d SHA-256: cd963e3fc04653ef67b84fcbd9355b1725dd35f428e8d10b7f65fe9f3f643f95
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains lures for 'free generators' and 'game hacks' for popular games like Roblox, directing users to a malicious redirector URL. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/roblox-free-accessories-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/booga-booga-cheats-roblox-deutsch_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-hack-deutsch-youtube_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-for-computer-nly_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-minecraft-bedrock-for-free_GM479516143.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_off00002aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA2 22164 bytes
SHA-256: c1e121c720c5d9f17289bbb219749eff6fbdeeb1d7e8e3f57b54cc098f756345
font_01_sfnt_off00005bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC6 18768 bytes
SHA-256: 43a1c2d0afcd82e775e61e55c2e0c8a016c3844b087109c53c024c689feb06a9

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