Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc97937a824c3cd…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 01:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fbbacd062c15187d26163a4ea2aa6e32 SHA-1: e85608d539b1abaf0e61d1f90c2f5ff71082748b SHA-256: 5dc97937a824c3cd23bc724823efb4756ca4a054d205c1c7b87f817bad24da73
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a lure for game hacks and free currency, specifically referencing 'free Robux'. The document body and embedded links point to URLs that are likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URI actions suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/free-robux-no-human-verification-no-survey-game-hack PDF link annotation
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/cm-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/what-do-roblox-points-do_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_off000047c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C3 25148 bytes
SHA-256: 0c588f879a60f2131eb10e157ebfe4da7e4a5e9c0ac01fcb04fdc0ca4a31ee34
font_01_sfnt_off000081cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CF 19156 bytes
SHA-256: 339d1e55aee7c6169fc9e26e1541ea9d6c779f781f53a8c1d652dbe4fbeac478

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