Malicious PDF — malware analysis report

Static analysis result for SHA-256 835df370885d027d…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 03:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab80cb35544129af50fcec6846d207f7 SHA-1: d254e2317b2596408b56050a64428411f5273c25 SHA-256: 835df370885d027df78e3d34d5ada78a591ef5dcaf8d18dc93c01a0e6a3529df
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a link farm of SEO-optimized PDFs and a call-to-action button to entice users. The primary URL, http://netcdn.tw/app/406889139/daily-coin-master-free-game-hack, likely serves as a landing page for a malicious download or exploit. The ML classifier strongly supports the malicious verdict, indicating a high probability of harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/daily-coin-master-free-game-hack
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack-2021-no-verification_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/how-to-get-100-robux-for-free_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/coin-master-apk-mod_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/https-wwwrobloxcom-hacks_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-minecraft-texture-packs-java_GM479516143.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-roblox-hair-girl_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-minecraft-coins_GM479516143.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-roblox-accounts-whit-gamepasses_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-roblox-accounts-2021-with-robux-october_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/coin-master-rewards-free-spins_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/22-500-robux-free_GM431946152.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/minecraft-marketplace-free_GM479516143.pdf
    • https://elearningmts.isl.sch.id/__statics/gudangsoal/files/download-coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000310e.bin
edea46b10ad56b11b45075d887c8abe47b7aba01adf67187ecd0afbbe0af2015		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310E 22884 bytes
font_01_sfnt_off00006482.bin
3a070d01991ba37d1b66f5afcb0e496dea45e938f3f711e2358dbb8585b43e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6482 18420 bytes

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