Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac76ebe0f190ec15…

MALICIOUS

PDF

47.4 KB Created: 2021-06-09 17:29:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5f74e109c0c29f06ef5bdd96065e97db SHA-1: da7d8bc2997c19c58b5346623d4cdec43e8833f3 SHA-256: ac76ebe0f190ec150396048f47f0195b683d2c7cffa35d3e173549a1fc6db4e7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external links, many of which are structured as SEO-friendly slugs pointing to game-related cheat files. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The document likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/april-2021-roblox-hack-game-hack
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-rblx-market_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-guess-the-song-cheat_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/arsenal-hacks-roblox-2021_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/apps-to-get-free-robux_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/coin-master-free-link_GM406889139.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/youtube-hack-roblox-accounts_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/counter-strike-roblox-offensive-hacks_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/como-hackear-cuentas-de-roblox-gratuitas_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/tiktok-like-bot-free_GM835599320.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/e400-free-roblox-gal_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051f4.bin
b4a0cbc067fb83842884c7918749358b1bd3390499389c25d123d13e5d2acf0b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F4 24864 bytes
font_01_sfnt_off00008ac7.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC7 2824 bytes
font_02_sfnt_off00009476.bin
09a25d9337e486ca9f2ca36a4f6018f98cc0a13120bd9fa2eb8dd725e3454a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9476 18880 bytes

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