Malicious PDF — malware analysis report

Static analysis result for SHA-256 2237cfb3ef91e139…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 07:35:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 754dcee9ff0e1d275fe264b452c5dfea SHA-1: 35971f466256880e2e25a2a818be903f24f3a772 SHA-256: 2237cfb3ef91e139959293851e8d37ce2cacba4a57e938006c680441fd965bf6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-come-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive users to potentially harmful content, aligning with spearphishing attachment techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-come-game-hack In PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-tips_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://www.moledigital.co.uk/uploads/files/files/como-hackear-coin-master-2021-espaol_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
font_00_sfnt_off00004be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE6 24264 bytes
SHA-256: 772144ae790012e160a698b07f1f77d482ca95b21df59104cda767cabbe2845d
font_01_sfnt_off000083b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B7 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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