Malicious PDF — malware analysis report

Static analysis result for SHA-256 3165ec878e8b4350…

MALICIOUS

PDF

51.9 KB Created: 2021-06-07 12:50:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a234ce7098faf5dc9343af285845c4ad SHA-1: 21240143814f074224616ac47983f6b326a33e6e SHA-256: 3165ec878e8b43506fc8f147e08867e7307fcda459f2d95e5a3fe2144bb0dcbc
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA to lure the user into clicking a malicious link, which is a common social engineering tactic. The embedded URL points to a resource that likely serves a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.tw/app/431946152/10-roblox-gift-card-free-game-hack PDF link annotation
    • http://eltisstudio.sk/images/all-twitter-cheat-codes-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/tiktok-free-no-download_GM835599320.pdfIn PDF document text
    • http://eltisstudio.sk/images/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 25700 bytes
SHA-256: 7d80267ee0f323f5845b6bf7e2e424a72e26d98abd1d123b8ba8ea5e748ebe4e
font_01_sfnt_off00008dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 7580 bytes
SHA-256: 45ef8985bd1b3cc36239daaaca12fe80fc6cc4c44b76bf0cdac5a4e7e35b986f
font_02_sfnt_off0000a6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BB 18852 bytes
SHA-256: f026bb6ee8e6988b5a2933653e37971f6582bd03f83e51aa52d8f78c5162c91b

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