Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bb93301fabccc2…

MALICIOUS

PDF

50.4 KB Created: 2021-05-16 20:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23339f15c1e2876c08d71715b83c74bb SHA-1: d18b13ec7486b0d90edf5ce4f6e4866f97d1cd68 SHA-256: b4bb93301fabccc29412de1590ad6a70e41bdeaf96e9a0fd850a6124ec93ee65
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent link to a 'free Robux generator', indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. While no scripts were explicitly extracted, the document's structure and content suggest it's designed to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/free-robux-generator-2021-no-survey-game-hack PDF link annotation
    • http://eddieblum.nl/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://eddieblum.nl/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://eddieblum.nl/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/coin-master-link_GM406889139.pdfIn PDF document text
    • http://eddieblum.nl/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://eddieblum.nl/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://eddieblum.nl/images/adopt-me-roblox-hacks_GM431946152.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_off00004931.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4931 41016 bytes
SHA-256: b7cd6fd547e2338333917036da943e1902efcd3574893836a2fbfce3fd7c0843
font_01_sfnt_off0000a0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F5 19044 bytes
SHA-256: 6a3befe032ce85dfab02daa9542f37d979e32cd852f1a969db8cf02301732b57

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