Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dc16e3310ec067…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 05:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ac9e92a36cd202a35ba544e5468d6d63 SHA-1: 96cc33ce735326a291ea1fd4a8e4dcd65b53915d SHA-256: a6dc16e3310ec067345bf0a5ad696c03858122ef34bf327bf7b906770188713d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external websites, many of which are disguised as guides for obtaining in-game items or currency. The primary URL, http://netcdn.tw/app/406889139/master-coin-free-spin-game-hack, suggests a lure for a game hack. The presence of a link farm and ML classification strongly indicate malicious intent, likely to trick users into downloading malware or visiting malicious sites.

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/master-coin-free-spin-game-hack
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-get-a-free-scarf-in-roblox_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-cheat-in-roblox-bad-business_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/microsoft-store-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/cool-free-outfits-in-roblox_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/cone-master_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-use-redstone_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox-rules_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/can-you-play-minecraft-for-free_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox-how-to-get-free-unlimited-robux-hack-glitch_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/minecraft-name-tag-hacks_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-robux-group_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/get-me-free-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/coin-master-free-spin-whatsapp-group_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox-script-hacks_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-games_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000347d.bin
c1251f8d8fe73e70129b0a2cc1196076208e99943fdccf8596d926f2ea122cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x347D 22860 bytes
font_01_sfnt_off000067db.bin
e7ebdb51c22119da7989f291c4e1e79e43f48b2212e10ddb7071af0af135db83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 18176 bytes

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