PDF malware analysis — malicious · 5d41290720d44d4c

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 19:16:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: be1e7664a61f6c417f70ce2191a791ee SHA-1: 90f800b1bd34ed9d9fb16beaad1f9dfb4b105e72 SHA-256: 5d41290720d44d4ce68ab95143a80eb6552b0214f35e3e973690752840bcc8d5

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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/406889139/coin-master-level-4-game-hack PDF link annotation
- https://www.wearmyspex.com/uploaded_files/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/microsoft-robux_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/hacking-my-boyfriends-roblox-account_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-spin-coin_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-hacker-tshirts-images_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-no-survury_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-speed-hack-2021-february_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-gray-hair-accessories-roblox_GM431946152.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021_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_off00003498.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3498	23252 bytes
SHA-256: `507ae7a8cfcdac3eb5475c29b9a9112c89b5b162498be11fefef56702097be21`
`font_01_sfnt_off000068b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68B1	18084 bytes
SHA-256: `2b25429d4f62ce8bcc27b9cefab35a7be2cc11d3dff90dca1f7975a4c2ff109a`

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