Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a34f5e32cba7c4a…

MALICIOUS

PDF

40.6 KB Created: 2021-05-10 16:22:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ed7b3ffd909d97359d74d2f8798c43f2 SHA-1: ffbde957b107773e303967c24ca476a6bbd90b13 SHA-256: 8a34f5e32cba7c4ab07088b91f223941c12b5d3f94a19e70efba8a2855403583
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a game hack, impersonating Microsoft, and directs users to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of multiple suspicious URLs reinforces this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/rewardex-robux-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/rewardex-robux-game-hack PDF link annotation
    • http://bgnails.nl/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/all-minecraft-handbooks_GM479516143.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_off00003f8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F8E 26792 bytes
SHA-256: 7a8aa8d57d47db0485c5d71e5d5a318d67c6c40f09e495573ce710347f3a9c6d
font_01_sfnt_off00007c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 18416 bytes
SHA-256: 91cea90fcd43e96c29d32d7d1c05fec8b48306368efea06df772574bb2ca2603

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