Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fb505e2965d925…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 19:06:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4828f20502ecc3b81a5d8808d414dc7e SHA-1: ccb29ff2d0f76dab742b5b5bbb2b495074a38cb6 SHA-256: 07fb505e2965d925cbb564f5c2733e0be64aaf1794a0e5240c1f224f029a135e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The primary malicious URL identified is https://netcdn.online/app/431946152/pastebin-roblox-hack-robux-game-hack. This lure is designed to trick users into clicking through to potentially harmful content or further malicious downloads. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/pastebin-roblox-hack-robux-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/body-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiktok-free-liker-apk-download_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55A8 25628 bytes
SHA-256: 0c3b63259cf8371a5d3c3162fef23c48fe9648e0bfa50d96e67fd5c13fff4cc4
font_01_sfnt_off0000905f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 18700 bytes
SHA-256: 03f5f30da67f8b048a25174d8ffa4c21e0535e169af7d78a7cadac3519b8cb6a

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