Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb61efcf32c8acdb…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 15:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73132e4c744a9ee05563e1fece0a7aad SHA-1: dcc9ee570172681e462f07b9d7da0407c289917f SHA-256: cb61efcf32c8acdb5a18df803deb2642e7912c9a168a4bf83bb4161533a66a5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.online/app/431946152/real-robux-codes-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed to trick users into downloading potentially harmful content. The document body, though partially corrupted, contains references to game hacks and free Robux, reinforcing the lure.

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/real-robux-codes-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-scripts-pastebin_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_off00004e60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E60 26412 bytes
SHA-256: 8b4c5a0fce45a3c372207185e57f02f3df7e4c30857ccdff8cf0c8cab99c8556
font_01_sfnt_off00008bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000098e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E4 18324 bytes
SHA-256: c4f7742aedc28b29f193bf98a15545964ca2d90d022e69fc2fcba8726d0ec952

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