Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e0319b72360825…

MALICIOUS

PDF

36.7 KB Created: 2021-05-24 19:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7d8609cf7f56a18eee48ba50822be0a3 SHA-1: e1b2794dad94a76f1331cc3cc41de3b53c3da3fd SHA-256: 41e0319b72360825fcb2fdd2c90ccd756ffedecc1e255870c8ffa2fe71780ff7
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, instructing the user to click a link to obtain game-related rewards. The embedded URLs point to suspicious domains, and the ML classifier flagged the document as malicious. The document's content and heuristics suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/406889139/coin-master-free-spins-link-today-instagram-game-hack
    • http://colsaf.co/images/legit-coin-master-hack_GM406889139.pdf
    • http://colsaf.co/images/free-minecraft-accounts-2021_GM479516143.pdf
    • http://colsaf.co/images/roblox-free-clothes-hack_GM431946152.pdf
    • http://colsaf.co/images/free-robux-co_GM431946152.pdf
    • http://colsaf.co/images/pokemon-go-free-pokemon_GM1094591345.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000339a.bin
55cbd9c8795c547f9b4c8d4662c2443bb6aa33912eeb81164be345e02822d024		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339A 24512 bytes
font_01_sfnt_off00006c00.bin
c3cae131f36bdfe9c813bd150295f39ca0ceeabf3546a2df254cc03f93d9c6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 18960 bytes

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