Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fefa13d8acbe779…

MALICIOUS

PDF

40.7 KB Created: 2021-05-20 22:44:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a79a08a65dbb1f02f97968dd7cafec08 SHA-1: 301b2280d2063ed831967e25dfbf38635c7348fb SHA-256: 7fefa13d8acbe7799ea675bfd70cc0d248a1c7eb12a6b0800f3fd1ea31f61007
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file contains multiple links and a call-to-action phrase, impersonating PayPal and luring users with 'Robux Hack 2021' to a malicious URL. The document body and heuristics indicate a credential phishing or malware download attempt via the provided links. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7499

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/robux-hack-2021-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/robux-hack-2021-game-hack PDF link annotation
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/tiktok-free-song_GM835599320.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-premium-free_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_off0000351c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351C 27400 bytes
SHA-256: 9a0bb8fef9516d89bec1a29f453a8ae5e1a5e29a973156752eaa16e63ea70caa
font_01_sfnt_off00007294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7294 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C33 18648 bytes
SHA-256: 960613bb0fa4c19a2503237e067522a4d484b1b5f3e7387dbdf2c2d9282ca05f

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