Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b5cd6bc1616bac…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 22:01:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5771e9b9aaa21b8480dca059cfc4b59f SHA-1: abb47df9a65c4c70009348d6f5fc4479f0160bd8 SHA-256: b3b5cd6bc1616bac9bd12f3ccf0c170671ec5755f905e3246b00d4905e17e941
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to websites that promise game hacks and free currency, a common lure for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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/are-robux-generators-safe-game-hack PDF link annotation
    • http://picuruta.com.br/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free_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_off00004b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B24 24572 bytes
SHA-256: 1cf4dd120bc923bc85643521da2a38b564d1b148c3d489af4c346f480795e9b3
font_01_sfnt_off000082eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82EB 18184 bytes
SHA-256: 864294972f286b078c62572d92c49db1c24ef2249559bbd6e986b6e0367e0f63

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