PDF malware analysis — malicious · 3c2803c1cb8b954e

MALICIOUS

PDF

42.4 KB Created: 2021-04-26 03:01:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 569e9d842ccba7c8591ff7fdbf39911e SHA-1: ed5e6dc15c529ce01711295d5a2860d4578b35f3 SHA-256: 3c2803c1cb8b954ecc26d19b989f3ef180ce2968917ec33ee7d0a48cbb3deae8

130 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits malicious behavior by presenting a fake CAPTCHA and instructing the user to disable security software, likely to trick them into downloading a secondary payload. The document contains numerous links to external resources, including one at https://netcdn.xyz/app/431946152/free-roblox-cbro-hacks-game-hack, which is highly suspicious. The ML classifier also flagged this PDF with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

Heuristics 6

Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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-roblox-cbro-hacks-game-hack PDF link annotation
- http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-hat-in-roblox-2021.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-accessories-on-roblox-2021.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-acount-info-hack-with-robux.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-pastebin-no-subscribe-2021.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-use-a-cheat-on-roblox-jailbreak-2021.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/free-account-in-roblox-2021.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-bc-hack.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/online-free-roblox-games.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/free-cool-clothes-roblox.pdfIn PDF document text
- http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-vampire-hunters-2-going-through-walls-hack.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000043cf.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43CF	28236 bytes
SHA-256: `a7ab064ab5c884780d9fb5a93eed62638012ff98a86d34816dfa086112cda1f4`
`font_01_sfnt_off000083d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83D3	18344 bytes
SHA-256: `ae2eb9c6a6b69695c18cd1948842d5f1832204a984acfaaafada26f8ba1aa0ed`

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