Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4c00e747e09f5…

MALICIOUS

PDF

43.8 KB Created: 2021-05-16 21:56:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0eb37ede6fd2842677e4a48e3b268163 SHA-1: cbcc356779716286b910e13f1f3e7883d5ae6269 SHA-256: 9cd4c00e747e09f5557c87472b7336f4b6c2b77f0cc77c80b290fc90db0f0591
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free spins' for the game Coin Master, coupled with a prominent link to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of multiple embedded URLs pointing to potentially malicious domains suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 3

  • 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.xyz/app/406889139/i-can In PDF document text
    • http://bufbd.org/images/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/master-game_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-draw-2-roblox_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_003_off000046c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C5 24620 bytes
SHA-256: e6b2f6fae810ef476bdc25b02a1c71e9002ef6234a440cf68efedf0801d39a9a
font_01_sfnt_off00007ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8996 17952 bytes
SHA-256: ff0c2fd87def8c3d08bc052d35a059552b69b6ff80e738d461809d40e2b5bde5

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