PDF malware analysis — malicious · ebfd620b6847d773

MALICIOUS

PDF

48.7 KB Created: 2021-05-15 13:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: f152390adee98dcb780531da981669ad SHA-1: bf248df217f2cfa5e5e225ad5207aa91a7c37c84 SHA-256: ebfd620b6847d77347572700d0329b1acd7ad4ebb6c8a9cb4726fed375ef9b63

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 0.9228

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.xyz/app/431946152/robuxy-com-generator-game-hack PDF link annotation
- https://www.astrospace.com.tw/upload/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-come_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-roblox-accounts-with-robux-that-work-2021_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
`font_00_sfnt_off00004a98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A98	28824 bytes
SHA-256: `0164dc98da8ed269d723d3cea0a1a4e8f39a697afba93a750dedfccb042bb3ee`
`font_01_sfnt_off00008de8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DE8	3984 bytes
SHA-256: `61feddb4b3b4ee76be7ca3ae319bc5f21a59738cfc5c33edbd15640e13714fe4`
`font_02_sfnt_off00009af1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9AF1	18624 bytes
SHA-256: `564b676c83dfcfb2d17032d30a69b1d7bc1cf309ea05e1634c9d6195baca18fb`

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