Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a2df2adf997e77…

MALICIOUS

PDF

40.6 KB Created: 2021-05-12 01:06:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0385740b88d1706c72e64f5aed3c7507 SHA-1: 33d109745e0b1c1a3aeed962070845f35be8228c SHA-256: a7a2df2adf997e7765a47d59bdf34c2b8b68e541298e0b2afd856b367b49f1f5
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites that impersonate brands and promise game-related benefits, such as free spins or game hacks. This is a common lure for credential phishing or to redirect users to sites that host malware. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick the user into performing an action that could lead to compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/how-to-send-free-spins-on-coin-master-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/406889139/how-to-send-free-spins-on-coin-master-game-hack PDF link annotation
    • http://kermas.eu/images/_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-net_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-group-payouts_GM431946152.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
stream_003_off000046a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46A6 23776 bytes
SHA-256: 4d6f66aaf39887d959626d27ea08039cd138302917ee2c3cd1699f773dac27a0
font_01_sfnt_off00007c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 18224 bytes
SHA-256: d00f7bd7e6d98a9c881f31d4bf80def427e9c83cb097cf2f19ca8a4d4a08bd16

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