Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e285f5bf72bb44…

MALICIOUS

PDF

47.0 KB Created: 2021-06-07 19:21:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7073c09a819afc06ad7c83a3a63e142e SHA-1: 314d2d11f8f94edadf96cdf52f51278f91db6ea9 SHA-256: 36e285f5bf72bb4458dc6cbcbbce0253cd18af71a1447b4fc3d615508b8da3fb
82 Risk Score

Malware Insights

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

The PDF document contains a lure for "Free Robux Generator" and impersonates Microsoft, directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious. The embedded URL and the document's content suggest a phishing or malware distribution attempt, likely involving a user clicking the link to download a payload or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.tw/app/431946152/free-robux-generator-no-human-survey-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.tw/app/431946152/free-robux-generator-no-human-survey-game-hack PDF link annotation
    • http://parsbaft.com/images/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://parsbaft.com/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://parsbaft.com/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://parsbaft.com/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://parsbaft.com/images/free-robux-hacls-no-download-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://parsbaft.com/images/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://parsbaft.com/images/coinmaster-spin-ml-link_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_004_off00005299.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5299 28820 bytes
SHA-256: 8f9f330a5257a9e15d0ee9694c356b32ffa36e6a8aabd1496b424097eef62957
font_01_sfnt_off00009346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9346 18900 bytes
SHA-256: 373f33db6e92a796246e2aeca8c689d1bc8f191d483a88540afa16f28c0b7332

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