PDF malware analysis — malicious · f2e75485f36c1d3f

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 15:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 0edcf45f7b3d8dbecd83d1515241afd3 SHA-1: a9f444d620af87f5e342270e14d11d92cc84f106 SHA-256: f2e75485f36c1d3fb5129b2880052f13cd2dc3b873861bf1d3d84dc5f256d7c0

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file 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 0.9865

Heuristics 5

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.online/app/431946152/roblox-help-free-robux-game-hack PDF link annotation
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/mc-update_GM479516143.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/krnl-download_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/minecraft-hacks-wurst_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_004_off0000518c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x518C	25432 bytes
SHA-256: `66f89a49a9c7d6a1cd5d9728b22eb3755dddafa1e5a9212cc0aa5c9bbf343b5b`
`font_01_sfnt_off00008c7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C7E	18264 bytes
SHA-256: `4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127`

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