Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bd7789875c2e8…

MALICIOUS

PDF

40.6 KB Created: 2021-05-23 02:09:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 830bd0b6b92fc33ef9417ba4e155f838 SHA-1: 138f7e348c6ed12ba0e14bb70e9c22698d93d17c SHA-256: 773bd7789875c2e84fa77a951eefa3cec691db52c482d92592b5c5080e953926
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7718

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.
  • 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/835599320/free-tiktok-followers-no-human-verification-game-hack PDF link annotation
    • http://svp-steinmaur.ch/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://svp-steinmaur.ch/images/earn-free-robux-for-roblox_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_off000034ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34AE 25084 bytes
SHA-256: f02b9aaf86e403696c6f3c7f75b8d8ffc6cc51e56e0205a55c4a3d5c75b0d8ad
font_01_sfnt_off00006ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE6 4148 bytes
SHA-256: db7ec909c907b23088a98ecd4cd288b476f2f66785a6e3d81bc6469138abe306
font_02_sfnt_off00007cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBC 18456 bytes
SHA-256: 6fa1441c1a321216f6114c799401e851ec7285796cff0c56691a74954fdf2722

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