PDF malware analysis — malicious · 552dfdc5a805e224

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 03:02:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: e95211a618f0866c3832ba12fba842c6 SHA-1: b65c5085b549354f4b0836618d0c0736d303b45f SHA-256: 552dfdc5a805e224302bfec59f4590709a85afc881e4f534fe91c624d4c41a9c

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly mentions 'Free Robux 2021' and links to external sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the lure of free in-game currency point towards a phishing or malware distribution attempt.

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/free-robux-2021-game-hack
- https://mawaridschools.com/uploaded_files/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/minecraft-java-free-download_GM479516143.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/coin-master-free-coins-link-2021-today_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/how-do-you-fly-hack-in-roblox-murderer_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/roblox-free-no-sign-up_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-roblox-aimbot-in-every-game-for-mac_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/coin-master-deals_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/hack-spin-coin-master-2021_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/roblox-gang-rape_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-t-shirt-roblox_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-robux-group-payouts_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/how-to-hack-coin-master-spin-ios_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-spins-coin-master-links-blogger_GM406889139.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/roblox-car-crusher-28-hack_GM431946152.pdf
- https://mawaridschools.com/uploaded_files/userfiles/files/free-minecraft-account-and-password_GM479516143.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000031e9.bin` `93034436579228f015671f89a182c136223ee39ec84c3ba052d49548ccf60ea1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31E9	21992 bytes
`font_01_sfnt_off00006294.bin` `bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6294	19116 bytes

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