PDF malware analysis — malicious · 0c1fc22f65b0bc39

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 07:24:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 1e619ca5037e29e06ea3c179b1b6eae6 SHA-1: aae8ceb4d444c822070e695af395d6a920616540 SHA-256: 0c1fc22f65b0bc39f27cd920130461565ebfb84eeb518c2db8278feef605ac05

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 0.9969

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/406889139/coin-master-hack-free-spins-game-hack PDF link annotation
- https://nhaphangjapan.vn/public/upload/files/free-robux-site_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
- https://nhaphangjapan.vn/public/upload/files/coin-master-hack-online-2021_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_off00004e13.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4E13	26012 bytes
SHA-256: `656541d736bdc0e707c581ec31c8cad487d0018b4e15bc5fb9a9508aec50efc5`
`font_01_sfnt_off000088f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88F2	18056 bytes
SHA-256: `12d79a7ddbb75c7a0854102822057d5441bee2ca4a20c79f8211a3d0b9a1f375`

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