Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ff6e52d7a5cc7d…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 19:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 01ca4788bc058b096f4123cbc526d053 SHA-1: c01a0e9e74e9a3d4578a68bd1bacd7d489092cfc SHA-256: 81ff6e52d7a5cc7dd075963d337b609d998c18281a5164158087969eee0ebe02
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure impersonating PayPal and offering free Robux, directing users to a malicious URL. This is supported by heuristics indicating a malicious redirector link and brand impersonation for credential phishing. The document's structure and embedded links suggest it's designed to exploit user interest in gaming and virtual currency to compromise accounts or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.xyz/app/431946152/huskybus.com-free-robux-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
  • 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/huskybus.com-free-robux-game-hack In PDF document text
    • http://schottlandfieber.de/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://schottlandfieber.de/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/coin-master-hack-pro-gamers_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.

FilenameKindSourceSize
stream_003_off00004ac2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC2 25452 bytes
SHA-256: 8ce1c59f9550e98ac0dc00980dae52258db62a8867fec8f6e1604e785a1c9828
font_01_sfnt_off0000855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 18688 bytes
SHA-256: 6add98f93d6464e4673e157e466f8eac90a499b9ef5784f234ada041ea0169f0

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