Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec833fd2c71f983…

MALICIOUS

PDF

48.7 KB Created: 2021-05-13 02:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 288075ce21a61f16d5fa8d4478f88577 SHA-1: d00374c0fc7ed28c20996349040f83b517fbf7ee SHA-256: dec833fd2c71f9832bba1ad7485204d8fc1af1a5db3242b9d70f48da3c31de92
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.xyz/app/431946152/robux-no-verification-game-hack PDF link annotation
    • https://www.metal.hr/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-no-human-verification-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.

FilenameKindSourceSize
stream_003_off00004840.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4840 37556 bytes
SHA-256: 851b999260298f3d168afcbd0f2bad65019ad52405a913ec49fa4ce8eca88c27
font_01_sfnt_off00009bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDE 18436 bytes
SHA-256: 7bd58a32436a1cd7e6b960dae53a6923ed98c563d453e9d292140b8243cceb65

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