Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f4fb8ece2d6b42…

MALICIOUS

PDF

49.9 KB Created: 2021-05-13 15:00:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 099bd25c75fa11e0458166de2b1188c3 SHA-1: 490e72e7105acf41fe85e24b3ad894ed0ba8191f SHA-256: 86f4fb8ece2d6b42bb1ef3ab3145a2e71c2fe58096aa2e1e5f1661482a3233d3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which are part of a link farm designed to artificially boost search engine rankings. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely by clicking these links. The primary goal appears to be directing users to potentially malicious websites offering cheats or hacks for games like Coin Master and Roblox.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/easy-free-spins-coin-master-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A15 24520 bytes
SHA-256: 29436d3797b9298441ce590e44d027c2c2c66bbdb41e5c7148427b58aa9ffe0a
font_01_sfnt_off0000826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C81 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA10C 18068 bytes
SHA-256: 2b5bcb60036e8604cee537a76a0c1d845177aa2c28f1eb7ce8b27015c89bb61f

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