Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c86b0814d1df7f…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 02:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 009f8d48de05fedec962bab82f68f50a SHA-1: 866f93ef7e1c7d7d8555d7e12e9bd94d023f6d38 SHA-256: 85c86b0814d1df7f11bcfeb4fb586c71b830e97b732f821f99b96ed0c4ba27e6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized slugs pointing to game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to game cheats and a primary URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/free-spins-and-coins-blogspot-coin-master-game-hack
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/minecraft-for-macbook-free_GM479516143.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/card-hack-for-coin-master_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-hack-iosgods_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/free-roblox-account-generator_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-actually-get-free-robux_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-without-survey_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/hacks-for-roblox-jailbreak_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/fast-robux-online_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-strategy_GM406889139.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/roebucks-on-roblox_GM431946152.pdf
    • http://elearning.mimunggulan-kotagorontalo.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049bd.bin
e2d23b24844ccca1aa9d69d2b90aa48fe5f99b5dd51c1bd3800bcb8eb1ff5480		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BD 23752 bytes
font_01_sfnt_off00007fa8.bin
f050b99fae15787f3dcd3a9ca1a9f1ede4f92304234d1532a9c4a0f9b5d220ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA8 18636 bytes

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