Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d37de5b9af9048…

MALICIOUS

PDF

36.2 KB Created: 2021-05-22 16:08:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3944cd634750e06747a10fc49e45379c SHA-1: fe1684a298a49adedd14e2b7f2d7ba806b129b2f SHA-256: b8d37de5b9af9048bc321a0d78582e1b19b8c6e543fd157709d1ced6bd77642a
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9648

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/406889139/free-spins-and-coins-for-coin-master-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/406889139/free-spins-and-coins-for-coin-master-game-hack PDF link annotation
    • http://gops.pruszczgdanski.pl/images/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://gops.pruszczgdanski.pl/images/free-coins-on-coin-master-2021_GM406889139.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_002_off00003254.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3254 29384 bytes
SHA-256: 1b0856a40ef5392ca759388330d8ab139cf1c0c644a37a19a4c960c577fc8250
font_01_sfnt_off00006d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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