PDF malware analysis — malicious · c771c9b2fa59fbab

MALICIOUS

PDF

42.5 KB Created: 2021-05-15 14:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 4fdcb543c6c69276a4f453ee3b284d92 SHA-1: 90b77a47ddc5195970c79b60f1a9d57d3da0bf1f SHA-256: c771c9b2fa59fbab0725e51f95057b2826f10a42bf01b91ee5e485ff72da7932

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 0.9971

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 https://netcdn.xyz/app/431946152/roblox-com-free-robux-game-hack PDF link annotation
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
- http://www.clooetherattorneys.com/uploaded_files/userfiles/files/minecraft-free-download-mac-full-version_GM479516143.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_off00004971.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4971	25916 bytes
SHA-256: `d1cb6b9b15a8bc01e0ea1002ed7cc746ec0084fd7228c323a59288ce10cca9b4`
`font_01_sfnt_off000083c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83C7	18348 bytes
SHA-256: `c296ce3e2e2a101d3e2a91d968c24b195b6c9a3a72cf9c6f74fe8dc429b2d5e3`

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