PDF malware analysis — malicious · 045edced5361f9a6

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 04:37:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 0097799c59b3fe575d081b24e95faaad SHA-1: 1030faba7fb84c1d0a00ea06592be14a9f7f9298 SHA-256: 045edced5361f9a6ff09e4ea59cf2b419d27d44181d269389326a317f6f5e834

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDFs, suggesting a link farm or content aggregation strategy. The primary URL, http://netcdn.tw/app/431946152/robux-page-game-hack, combined with the document body's theme of free in-game currency, indicates a lure for users to download potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a malicious workflow aimed at user deception and payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

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.
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 http://netcdn.tw/app/431946152/robux-page-game-hack PDF link annotation
- https://www.skygan.com/uploaded_files/userfiles/files/how-to-get-free-robux-xbox-one-2021_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/www-coinmaster_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/do-you-want-free-robux-song_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/how-to-use-cheat-engine-on-roblox-undetected_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-robux-no-buying-anything_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/pubg-50-uc_GM1330123889.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/how-to-get-free-and-easy-robux_GM431946152.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
- https://www.skygan.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.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
`font_00_sfnt_off00003011.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3011	22332 bytes
SHA-256: `4a19cd305efd8433da6f9eb03b6a12f0f097fe535d8452b552659a1ce274df37`
`font_01_sfnt_off000061ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61CE	18708 bytes
SHA-256: `85351036e61ce7a0f3d06f8f5c7cd377a9c3d874a20f377d4e526a0d18450229`

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