PDF malware analysis — malicious · b02a5b6d19ee4923

MALICIOUS

PDF

43.7 KB Created: 2021-06-08 18:04:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: dc203d2c2ab659721362963292d66344 SHA-1: 6d4a11e6fef162dd7cba89b1d8053f8bcf2d9fde SHA-256: b02a5b6d19ee4923373558debc89e6d1f963b06fca77726a5f4e1219fbc42cfb

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.tw/app/431946152/roblox-hack-2021-free-robux-game-hack PDF link annotation
- https://www.iosas.info/uploaded_files/userfiles/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/roblox-svg-free_GM431946152.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/coin-master-apk_GM406889139.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
- https://www.iosas.info/uploaded_files/userfiles/files/coin-master-free-spins-hack_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_004_off00004ea3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4EA3	24296 bytes
SHA-256: `861884841985b53dc611e8ec8be69928cfdb8f12d551315f97a3edb2464f4cfd`
`font_01_sfnt_off0000863c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x863C	18888 bytes
SHA-256: `e5048bbc4edf2f5dd7322e95a947012ee46af55ba93680db3aa673aa54d39569`

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