Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8cf173c29b49d5…

MALICIOUS

PDF

43.1 KB Created: 2021-05-17 16:16:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ff2fb482e93562c1a4a0b74f583d295c SHA-1: d8053ceab5583f54cb47bcab7c4b1370d449d618 SHA-256: 9d8cf173c29b49d5c557f2451dcf2f8f8325a9d86430b43e643e709d48ee1de2
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a primary URL pointing to a site offering free Robux, suggesting a lure for users interested in game hacks or cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and callback lures indicates a phishing or scam attempt. While no scripts were explicitly extracted, the document's structure and embedded links are designed to entice users to download further content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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/blox.pink-free-robux-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-map_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tiradas-coin-master_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_off00004960.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4960 25816 bytes
SHA-256: e56989168b6141f8d0f815a0e07a33609c5c3915c9fbcb81c2d0da5504b8fca5
font_01_sfnt_off0000852e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852E 18620 bytes
SHA-256: 20ad8a2126bb9f489cd4862944fdd8c1c01869fd803457c3ce1390bedb89f69f

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