PDF malware analysis — malicious · e4e026e1fab241d1

MALICIOUS

PDF

42.7 KB Created: 2021-05-17 07:39:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: ba62de4f2ef26769affbb691f54d3092 SHA-1: 4ad806fe831f4c70fcc9f0012c8870958432e9ac SHA-256: e4e026e1fab241d12e18bb59385cbfb1b3152f0793017c8c30a9096b5dc49dab

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 6

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/robux-hack-me-game-hack PDF link annotation
- http://apteka-ot-sklada.com.ua/images/what-games-give-you-robux_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/coin-master_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/free-group-roblox_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/hacks-master-coin_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/apk-hack-coin-master_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
- http://apteka-ot-sklada.com.ua/images/free-spin-coin-master-link-download_GM406889139.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_off00004a61.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A61	24896 bytes
SHA-256: `f901799fb1763d9c691d87fb03e3e2a95df9f32f60cdb94f6b115f64535f7863`
`font_01_sfnt_off000083f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83F0	18444 bytes
SHA-256: `63c17dbc7d8c7d1de0ff2471750372836806f4a6a54ec4612fcacbe2caf81c31`

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