Malicious PDF — malware analysis report

Static analysis result for SHA-256 8465c4e0d69b82ab…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 11:03:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5bebee79de75d092478aa758dd843629 SHA-1: 70575d3419846080ba87bfdfdf06c587fad77c9b SHA-256: 8465c4e0d69b82aba056c7fba67a3de562721eff4e240149d4d7014d03e1570d
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary external URI, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-generator-game-hack', is likely the destination for this lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/how-to-get-free-robux-generator-game-hack
    • https://www.unicor.co.th/assets/editoruploads/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/1x1x1x1-roblox-id_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-gift-card-free-codes_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-spin-free_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-by-watching-ads_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hacks-iphone_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/114-hacks_GM479516143.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/can-you-get-minecraft-for-free_GM479516143.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/free-roblox-clothes-2021_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/lucky-patcher-coin-master-hack_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/games-to-get-free-robux_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/free-minecraft-skins-xbox-one_GM479516143.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/op-rewards-robux_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/free-coins-on-coin-master-without-verification_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-70-spin-link-today_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/earn-points-for-robux_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-printables-free_GM431946152.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdf
    • https://www.unicor.co.th/assets/editoruploads/files/hack-coin-master-spin-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047c8.bin
3293e34d9185c21cc4881ec2ff1f0afd2c2b109faa7d2b30ea323d7dcda25c57
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C8 24488 bytes
font_01_sfnt_off00008019.bin
62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744
pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 6636 bytes
font_02_sfnt_off00009026.bin
02a745270f20da848e9c9bdefc0721d63769b74524dfc6c51231bae9bb0d5f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9026 18512 bytes