Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbcfb2861a1d2f7…

MALICIOUS

PDF

46.6 KB Created: 2021-05-14 15:43:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bfc95ebbffb8f81158cd5b1e6c82e302 SHA-1: 0df0ab982a0d9936d54c5b788a69d283287c9cf1 SHA-256: ddbcfb2861a1d2f7f58479ab1739f06ed1e1ebfaabcc03543e02502e01e11045
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and heuristics indicate a malicious PDF, specifically a brand-impersonation lure for PayPal, directing users to a suspicious URL. The document body, though heavily obfuscated, contains references to game-related hacks and free items, reinforcing the phishing pretext. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/cute-free-stuff-on-roblox-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/cute-free-stuff-on-roblox-game-hack PDF link annotation
    • https://www.brainpads.com/images/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/robux-converter_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004921.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4921 28236 bytes
SHA-256: 7186f571bd88e473f2aeb1089f23ddf73892d5b43f84242f725f4c0ade2129d3
font_01_sfnt_off00008a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A05 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000093b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B6 18192 bytes
SHA-256: a6b915e7016f468889ed3b93934f8cc43e4d030a5546ddc8b69dc33b37ef3c58

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