Malicious PDF — malware analysis report

Static analysis result for SHA-256 053e3dc0aea333d7…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 14:42:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 97ea4524305f7a952736dee1185d0571 SHA-1: a4c17a475e74184b78b52ccceb68d089ca82f5cc SHA-256: 053e3dc0aea333d77101cd22c9428984896b1ddef9884913cb12262f4a00d7cb
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into downloading malicious content, as indicated by the 'SE_FAKE_CAPTCHA' heuristic. It also features a large number of external links, many of which point to PDF files related to game hacks and cheats, suggesting a link farm or download lure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous external URLs and the fake CAPTCHA strongly suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/free-robux-pin-codes-game-hack
    • http://www.laborvetro.org/images/minecraft-hacked-client-download_GM479516143.pdf
    • http://www.laborvetro.org/images/coin-master-time-hack-ios_GM406889139.pdf
    • http://www.laborvetro.org/images/coin-master-heaven-links_GM406889139.pdf
    • http://www.laborvetro.org/images/coin-master-fan-page_GM406889139.pdf
    • http://www.laborvetro.org/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://www.laborvetro.org/images/coin-master-hack-spin-link_GM406889139.pdf
    • http://www.laborvetro.org/images/get-free-food-in-coin-master_GM406889139.pdf
    • http://www.laborvetro.org/images/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • http://www.laborvetro.org/images/free-coins-coin-master-hack_GM406889139.pdf
    • http://www.laborvetro.org/images/master-8-ball-pool-free-coins_GM406889139.pdf
    • http://www.laborvetro.org/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://www.laborvetro.org/images/coin-master-links-to-get-free-spins_GM406889139.pdf
    • http://www.laborvetro.org/images/is-coin-master-hacks-safe_GM406889139.pdf
    • http://www.laborvetro.org/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://www.laborvetro.org/images/free-robux-no-gift-card_GM431946152.pdf
    • http://www.laborvetro.org/images/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://www.laborvetro.org/images/roblox-microsoft-rewards_GM431946152.pdf
    • http://www.laborvetro.org/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://www.laborvetro.org/images/reddit-coin-master-hack_GM406889139.pdf
    • http://www.laborvetro.org/images/free-robux-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000490a.bin
a2fba710b46c63b3edf9c68c50096d4d81711393ebd6f3376f07d795bf2158a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x490A 24224 bytes
font_01_sfnt_off0000802e.bin
23872266a6577b01853888d52c04c526ac323517b7f86f8cb64f3b9e81653507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802E 18464 bytes

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