PDF malware analysis — malicious · 30ac2b3da0c5c22b

MALICIOUS

PDF

35.1 KB Created: 2021-07-07 16:05:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 93ca90c54f2b1a6d178e32b7d824490a SHA-1: 4eee5ce387bdddf9e31466c75c85aa2b52190548 SHA-256: 30ac2b3da0c5c22b86cd222f024cecab207c4cce317509f9e4f48129d2f65830

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/431946152/free-robux-generator-game-hack PDF link annotation
- https://www.vizyonproduction.com/application/uploads/assets/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-bypass-roblox-anti-cheat_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/roblox-cheat-engine-no-virus_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/roblox-www-com_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/ex7-roblox-hack-download_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-hack-program_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-do-you-get-robux-for-free-on-pc_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/www-roblox-com-download-free_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
`stream_002_off00003224.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3224	22688 bytes
SHA-256: `73566438bd45202790d72ae533c376130ab832c59dfea63a560991efb70b5978`
`font_01_sfnt_off000064d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64D1	18820 bytes
SHA-256: `da2f915db23b41a878f83961178ff4e79d82bfec54ff52f4ca014625624765bc`

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