Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b20b37f81bff2d0…

MALICIOUS

PDF

47.2 KB Created: 2021-05-15 16:38:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9376b31d545d8209d4df96cc7105844f SHA-1: cd2aff77f420f3fc3f32c6b43e16eea54afa6723 SHA-256: 1b20b37f81bff2d0e4623ec58601348264e642a616f534c08dead3e5b324e47e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1553.005 Mark-of-the-Web Bypass

The PDF document contains multiple embedded URLs that redirect to a "robux free 2021 game hack" lure, impersonating Facebook to likely facilitate credential phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure and a callback lure further supports a malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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-free-2021-game-hack.
  • 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 https://netcdn.xyz/app/431946152/robux-free-2021-game-hack PDF link annotation
    • http://studentslovetravel.com/images/robux-win_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/claim-robux_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://studentslovetravel.com/images/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://studentslovetravel.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://studentslovetravel.com/images/minecraft-pe-hack-client_GM479516143.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
font_00_sfnt_off00004b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B39 26488 bytes
SHA-256: 0e93c8be789c8306900316fba4a895408552d9383096af968abbd9f50354cb27
font_01_sfnt_off0000889d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000095ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95AE 18416 bytes
SHA-256: 1a644f5289783458eb76ac5741ebd0afe9ba6d8f40911ca8ddb4573f3c6c1b2f

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