Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e303dfef4f35e…

MALICIOUS

PDF

33.2 KB Created: 2021-07-21 21:50:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8f4d736f2aa13a5859b4a621814c5f7 SHA-1: 71ca0d45a48b0ed553a07b1c2e4bf8a067157dd2 SHA-256: 3a7e303dfef4f35e9f0fe1d21bc7a2f339a5c9fae6cf861e5784a0293ddc91c3
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a call-to-action phrase, strongly suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence. The document body and extracted URLs indicate a lure related to obtaining free followers or in-game currency for popular platforms like TikTok and Roblox, which is a common tactic for distributing malware or credential harvesting tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/835599320/get-free-followers-on-tiktok-game-hack PDF link annotation
    • http://kfz-service-etp.de/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-font-free_GM479516143.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
font_00_sfnt_off00002d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D57 23108 bytes
SHA-256: eb539e3d868dff40845b767bf10a82ae9b24c71af40c75f7b13237d6248c6fe0
font_01_sfnt_off0000616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616D 17692 bytes
SHA-256: 927e39851add4dfd479e94c7f363911e27b11f2d7b93d82bb30fff9f618b2f9d

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