PDF malware analysis — malicious · c19a786e326789b8

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 09:55:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: c1fec4f28e08402a72f2206d83b04d97 SHA-1: bbe41f9d8d0246c90ba8062460a3a264f6523f4b SHA-256: c19a786e326789b8fb547e3397767b63a0651549d1037dd7710da75239a516ba

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA and a 'free generator' lure to deceive users into clicking malicious links. The document body and heuristics indicate a clear intent to redirect users to external sites, likely for further exploitation or phishing. The embedded URLs are the primary indicators of malicious activity, suggesting a phishing or scam campaign.

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/how-to-get-free-robux-easy-2021-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/minecraft-free-version_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/freer-tiktok_GM835599320.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-card_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coins-coin-master-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_004_off00004f91.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F91	24804 bytes
SHA-256: `aa1431280ee4fd20c3b47958add82f9997d3a24bef854c6ec3d293d552386d55`
`font_01_sfnt_off0000883f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x883F	19092 bytes
SHA-256: `b4f5bd8c8985fe06cb8cafea7c6a35db41ab3230d9b691422e9309a9df735677`

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