Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fd65c94d87131b…

MALICIOUS

PDF

35.7 KB Created: 2021-05-22 09:49:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b72cbddadcf6bd44d4e9c40bf6e6475c SHA-1: 22f5ae86c07b4a0071914b790a0ccb841b1242ed SHA-256: 91fd65c94d87131b2c762f97a8a2609475113355fe7e58b21cea2a9a6d944a0e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document uses a 'ClickFix' social engineering tactic, impersonating Microsoft to trick users into clicking a malicious link. The link, 'https://netcdn.xyz/app/479516143/minecraft-mac-free-game-hack', is presented as a download for 'Minecraft Mac Free', but its host does not match the impersonated brand. This suggests a credential phishing or malware distribution attempt. No scripts were extracted, but the embedded URI and social engineering heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 5

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/minecraft-mac-free-game-hack.
  • 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/479516143/minecraft-mac-free-game-hack PDF link annotation
    • http://e-onlinearchiv.de/images/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://e-onlinearchiv.de/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-onlinearchiv.de/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-onlinearchiv.de/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://e-onlinearchiv.de/images/how-to-hack-someone-on-roblox_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_002_off0000336f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336F 24928 bytes
SHA-256: 93041e9f4c667a8b77ad6639bc0ec7515d51df5bb71ebc66f27c7ec1a0e1d661
font_01_sfnt_off00006c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C68 17568 bytes
SHA-256: 2778e064ee8e4e3a4bd3984a17bb7eaaeefaa41a67eb131b8ade69fe1653bbfc

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