Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c7b6bae0bf2a3e…

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 12:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5722ea4dd08c4ef42524cdbf8cccebad SHA-1: acd7536cd6371db9fad26af1870cbb4d294a6d9c SHA-256: a4c7b6bae0bf2a3ecbaeec73a8f695995ff63383ab3aee9604c427c4f9b0461b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering free in-game currency or accounts. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to solicit sensitive information like private keys or passwords. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a scam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/406889139/coin-master-heaven-free-spins-today-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-windows-10-free_GM479516143.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_off00004d0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D0E 24796 bytes
SHA-256: 87c593e433b309c217d47ba158ce32aaedb740f9f7bd0cf822e4e58a53d5105a
font_01_sfnt_off0000858b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858B 18356 bytes
SHA-256: 60a5a430713f1161b8494f77535ec8b7c572fc0a829325370a59d32a1885166f

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