Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8945c2c8a1dbae7…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 05:38:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af28b0166e4efac1d15e3d5b98de3e4d SHA-1: d985112c0a0f3bc5f73e7adc7d55dedceec5e210 SHA-256: a8945c2c8a1dbae73ad9540570fd780b025f446caf926fb105273376edf6c872
102 Risk Score

Malware Insights

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

This PDF document employs a brand-impersonation lure, specifically impersonating Paypal to trick users into clicking a link for 'free Robux'. The embedded URL, https://netcdn.online/app/431946152/free-robux-no-verification-or-survey-game-hack, is hosted on a domain that does not match the impersonated brand, indicating a phishing attempt. The document also contains callback phishing lures, suggesting a multi-faceted social engineering approach. While no scripts were directly extracted, the presence of malicious URLs and the ML classifier's high confidence score point to a malicious intent, likely to lead users to credential harvesting or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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-no-verification-or-survey-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-no-verification-or-survey-game-hack PDF link annotation
    • http://autoskola-scp.com/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://autoskola-scp.com/files/are-tiktok-free-views-hack_GM835599320.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5223 26224 bytes
SHA-256: 1b85e58f52156fceab6fbef6566d61b00dce25e24721cf488fcdf12e629dd91e
font_01_sfnt_off00008efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFB 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000098f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F7 18892 bytes
SHA-256: 85e8471d4bb7809b16494b43ecc998cec7f87bafeaec38a3001510264e72f0e6

Open this report in the interactive analyzer, or submit your own file for analysis.