Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac9d7aaba1301a2…

MALICIOUS

PDF

42.0 KB Created: 2021-04-25 08:10:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9b0374222eba092dd5747b830c710627 SHA-1: 406a7e11c73f04762bcf984a55e8c1e72dfe0c49 SHA-256: aac9d7aaba1301a20a6bd7840cf97efac7ba3ea515c665aeabeba153da2fd1f9
82 Risk Score

Malware Insights

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

The document contains a lure related to obtaining free Robux for Roblox, impersonating the brand to trick users into clicking malicious links. The primary link, https://netcdn.xyz/app/431946152/how-to-get-free-roblox-accounts-with-robux-game-hack, is hosted on a domain unrelated to Roblox, indicating a phishing attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.xyz/app/431946152/how-to-get-free-roblox-accounts-with-robux-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/431946152/how-to-get-free-roblox-accounts-with-robux-game-hack PDF link annotation
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-rocitizens-free-money-codes.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-pet-simolator-hack-script.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-nation-com-hack.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/comment-hack-sur-roblox-admin-commands.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-april-fools-hack-face.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-cheat-in-roblox-phantom-forces.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/dragon-ball-rage-roblox-hack-2021.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021-on-pc.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-change-your-name-roblox-free.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/hacks-for-roblox-jailbreak.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off0000461b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x461B 26084 bytes
SHA-256: 5eabeccace2d1557b99f98a18d9f30e0e0eb413f34282edf805f79876e093119
font_01_sfnt_off000080f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 18840 bytes
SHA-256: 5c405760cbc35d47814eb79d02329ef592958841df7a04edd3fa40410c7a1f17

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