Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe5f21190af30f…

MALICIOUS

PDF

44.7 KB Created: 2021-05-13 22:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ee9c9ad0638ff647c2b1d20410836ec SHA-1: 50809e7e805ca4353825a490f44f06cb50b707d7 SHA-256: bcfe5f21190af30f567469bd6bb1218290d2d56e829cfbd5ffdf595d6ea12f03
142 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with a large collection of SEO-optimized links. These links predominantly point to other PDF documents hosted on `legitame.org`, suggesting a link farm designed to drive traffic or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-roblox-hair-game-hack
    • http://legitame.org/images/how-to-get-free-robux-com_GM431946152.pdf
    • http://legitame.org/images/coin-master-daily-free-link_GM406889139.pdf
    • http://legitame.org/images/coin-master-free-card-link-today_GM406889139.pdf
    • http://legitame.org/images/coin-master-cards-free-cards_GM406889139.pdf
    • http://legitame.org/images/how-to-get-free-cards-on-coin-master_GM406889139.pdf
    • http://legitame.org/images/spin-links-for-coin-master_GM406889139.pdf
    • http://legitame.org/images/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://legitame.org/images/roblox-free-clothes-generator_GM431946152.pdf
    • http://legitame.org/images/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://legitame.org/images/2021-free-spins-coin-master_GM406889139.pdf
    • http://legitame.org/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://legitame.org/images/minecraft-pocket-edition-apk-free-download_GM479516143.pdf
    • http://legitame.org/images/coinmaster-free-cards_GM406889139.pdf
    • http://legitame.org/images/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://legitame.org/images/coinmaster-free-spins-link_GM406889139.pdf
    • http://legitame.org/images/free-spins-coin-master-2021_GM406889139.pdf
    • http://legitame.org/images/coin-master-free-cards-2021_GM406889139.pdf
    • http://legitame.org/images/roblox-lawsuit_GM431946152.pdf
    • http://legitame.org/images/coin-master-hack-reddit_GM406889139.pdf
    • http://legitame.org/images/coin-master-cheats-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000478f.bin
17cce45c9659391b04f38d568ba3ac3959405d86c9e8c08eae644a7561b50ea0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x478F 31408 bytes
font_01_sfnt_off00008bd1.bin
ea47dc0c1edfbc9ae5bf1a2aa7313d2e96bd533affdbf7eb9c043917809be324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 18564 bytes

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