PDF malware analysis — malicious · bc1b3fea9ae32aa1

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 01:56:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 89936a3cb16a636b369468abaa163d35 SHA-1: cb8f5ab1786b956a4c7919176bf69209874868d0 SHA-256: bc1b3fea9ae32aa19a44ce242950d1f11640197fb488ae9608168a534b598eed

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link. The link, 'https://netcdn.online/app/406889139/free-spins-for-coin-master-2021-game-hack', redirects to a malicious site, likely to download a second-stage payload. The presence of 'CmD' and 'endstream' tokens within the document structure suggests potential command execution capabilities, further supporting a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 7

Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX

Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix 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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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/406889139/free-spins-for-coin-master-2021-game-hack PDF link annotation
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/tiktok-free-login_GM835599320.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/rewards-roblox_GM431946152.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/coin-master-link_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/roblox-imagine_GM431946152.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
- http://perpustakaan.poltekkespangkalpinang.ac.id//repository/minecraft-hack-mod_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_off000055a8.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x55A8	24176 bytes
SHA-256: `72ff50c34d79254443fcd8bed206e56843dd0876339e0204146e5ce2c8fc39fb`
`font_01_sfnt_off00008c82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C82	18288 bytes
SHA-256: `66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217`

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