PDF malware analysis — malicious · b539bc13f1c2a5b1

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 08:40:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 622605d4ae248d0c85d9f8471a6052a2 SHA-1: 8bc0141361393e8cba7039db7153e4a04f56456c SHA-256: b539bc13f1c2a5b1d8da687007b6aa87bbdf8ca7a0b6afe0f0d7d3af19e0e466

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links and a lure for 'Free Robux', indicating a phishing or scam attempt. The heuristic 'SE_FAKE_CAPTCHA' suggests a deceptive interface designed to trick users into interacting further. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 6

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.
PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
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.online/app/431946152/get-free-robux-today-game-hack PDF link annotation
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-play-coin-master_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-roblox-groups_GM431946152.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
- https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-link-app_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.

Filename	Kind	Source	Size
`font_00_sfnt_off000050ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50EC	25256 bytes
SHA-256: `0072e702cef4f223c4490f768e8fca5623d942b8546f7e57d6f2c9df5126940a`
`font_01_sfnt_off00008a90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A90	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off000097a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x97A2	18700 bytes
SHA-256: `b843f73b4bd8c826713a813afccd99a06030f2bdc38aa1865c4ca07f2f1b4e6b`

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