Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ffeb508fddf1b2…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 23:13:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a776f288f2520033b375a64b468a4171 SHA-1: c93020a1649198e6ddf04bb1f039704add3e6c6d SHA-256: 84ffeb508fddf1b2567c6a633bdc8ce3aeeffddc6aaa999a64cd7028153fed54
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are SEO-optimized PDFs designed to lure users with promises of game hacks and free in-game currency. The primary URL http://netcdn.tw/app/406889139/free-coin-master-spins-hack-game-hack likely serves as a landing page or download source for malicious content. The ML classifier strongly indicates malicious intent, and the presence of a "download button" heuristic further supports a deceptive user interaction.

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/free-coin-master-spins-hack-game-hack
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-ios_GM406889139.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-gifts_GM406889139.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/my-roblox-account-was-hacked_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-coins-for-planet-master-game_GM406889139.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/roblox-robux-codes-hack-download-pc_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-spins-coin-master-app_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-xbox-one_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-free-spin-daily-bonus_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-ios_GM479516143.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-minecraft-pe-server_GM479516143.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/roblox-hack-site_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/pokemon-go-free-game-online_GM1094591345.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-robux-enter-password_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000331b.bin
d485145fb63a2b1007e792d634792a4ed36a150d7f299c1a1c575f254dbe2fa2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331B 24172 bytes
font_01_sfnt_off00006a41.bin
4d0657ae61433a99d4c3f327acf405e508756c248fc53430885ddf01c25216ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A41 18344 bytes

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