PDF malware analysis — malicious · 81825ed28bf651ed

MALICIOUS

PDF

49.1 KB Created: 2021-06-08 23:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: e6b524ab6bdcf81974a91e73da45773b SHA-1: 4946740cf470bfa254781fa3efab90d292702688 SHA-256: 81825ed28bf651ed205ecbb4e0b7cd1da7ef36041b02d49fd8f7017243a74ba4

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The presence of a fake CAPTCHA lure suggests an attempt to trick users into interacting with these links, likely leading to malicious content or further exploitation. The ML classifier also flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-shirt-game-hack PDF link annotation
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000051da.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51DA	28252 bytes
SHA-256: `ed42831b1b28363024c36510adc266a80ecb1ccb3adc9e52bb61421eb04078bd`
`font_01_sfnt_off00009344.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9344	2812 bytes
SHA-256: `fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f`
`font_02_sfnt_off00009ce5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CE5	18404 bytes
SHA-256: `bca4a3f778657c5ee55b368261a1ca5c4ea487017e63397aa47d80048de11d2f`

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