PDF malware analysis — malicious · c298dc4b24a847fe

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 05:03:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 90131c8dbe4024e55b665b6d165b8a9b SHA-1: 9284894a05bcafb5a8fa87df78b71ff8f90105d9 SHA-256: c298dc4b24a847fe55ae7608c75a0e7f3e115a43dc18c9d5c73cca8e237ada91

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to 'free Robux gift card codes' and impersonates Microsoft, directing users to click a link for 'human verification'. This fake CAPTCHA mechanism is designed to trick users into interacting with the malicious link, likely leading to credential harvesting or further malware delivery. The embedded URLs suggest a phishing or scam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

Heuristics 6

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
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-gift-card-codes-2021-game-hack.
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/431946152/free-robux-gift-card-codes-2021-game-hack PDF link annotation
- https://www.sarsen.net/uploads/files/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-hack-me_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/robux-today_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-hack-no-download_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_off000053cd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53CD	24856 bytes
SHA-256: `d6900983aa7d7c764e737d61c796b804781d2a637771a37660948578aa6ea8cc`
`font_01_sfnt_off00008d56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D56	19044 bytes
SHA-256: `a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b`

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