Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f49fc2ad12e6e4…

MALICIOUS

PDF

40.4 KB Created: 2021-05-20 21:12:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 794b02c15e2ca3540b5bb60adb23b8e1 SHA-1: 64fd9494be79652869b8e80d6c321d09c9716e0d SHA-256: 79f49fc2ad12e6e4a20c4db2969f1ec32e93d259581845ffabf750ed5209e012
82 Risk Score

Malware Insights

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

The PDF contains embedded URLs and document body text that impersonates Facebook to lure users into clicking a link for a "TikTok generator". The primary malicious URL is https://netcdn.xyz/app/835599320/how-to-get-free-followers-on-tiktok-without-human-verification-game-hack, which is presented as a call-to-action. The ML classifier also flagged this PDF as malicious, supporting the phishing and potential payload delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7768

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/how-to-get-free-followers-on-tiktok-without-human-verification-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/how-to-get-free-followers-on-tiktok-without-human-verification-game-hack PDF link annotation
    • https://dentmate.com.tw/image/data/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-do-you-get-free-robux-2021_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_off000033b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B0 26976 bytes
SHA-256: 822610daf1ab6f20bcdf0eb5201834115696c2a1d8bb96cc1e802644426e33f9
font_01_sfnt_off0000711a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00007b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2A 18820 bytes
SHA-256: 66503c9ff6afe40a68fb1dae2625f5b9c9d82fe8592aae771d392f7979d34d43

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