Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cc1e8b63ce792b…

MALICIOUS

PDF

40.6 KB Created: 2021-05-24 04:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e3c6b68935f159eb3d412008167acd6 SHA-1: 8a26ed6c91da68fe5e4889e2bc5b3ccf32d726bb SHA-256: 55cc1e8b63ce792b9f7725571ec439209dbcdffd89daf65215b0776969c46a3b
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free TikTok followers and impersonates Microsoft, directing users to a malicious URL hosted on 'netcdn.xyz'. This URL is identified as a credential phishing attempt. The document body and embedded heuristics indicate a social engineering tactic to trick users into clicking the malicious link, likely leading to credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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/835599320/free-tiktok-followers-no-verification-or-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.xyz/app/835599320/free-tiktok-followers-no-verification-or-survey-game-hack PDF link annotation
    • https://www.gvandenakker.nl/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-to-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_002_off00003418.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3418 27612 bytes
SHA-256: 8e1df8d76b98a021aa7640e680cdeb142e12a3568220a20831c93b5007c5d141
font_01_sfnt_off00007276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 2888 bytes
SHA-256: 2f5f0fc0bc2e44a39e81df338c202d2aa9228409b57f32fbedd5805dc83e19fa
font_02_sfnt_off00007c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C67 18492 bytes
SHA-256: 4d8c0727d58b59d2b63319bab821bc095baa93826ac3da826e0a8bde5531d4a4

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