Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dbbb1bf4098167…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 19:01:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 887b5d3c85ea3be06fe439f4566f0cd5 SHA-1: 2dc4ea1e61ca68d335e9f4e4c4f68e997efe8c79 SHA-256: 51dbbb1bf40981670dd45f77a89aa1ee994f4ab3f0d41a1ec4917bc4cfbadcdd
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The document impersonates the Amazon brand, but the linked infrastructure does not match. The primary malicious link identified is https://netcdn.xyz/app/431946152/roblox-com-r-game-hack, which serves as a lure to potentially download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/roblox-com-r-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
  • 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/roblox-com-r-game-hack In PDF document text
    • http://www.elleventi.it/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://www.elleventi.it/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://www.elleventi.it/images/roblox-how-to-get-free-clothes_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_off00004824.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4824 27344 bytes
SHA-256: 9913ce10bf79dc44c64bc86cb60eef82bd8fa89b36cbfa0f05ffe7b1b58a02d4
font_01_sfnt_off0000842c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842C 18044 bytes
SHA-256: 1bac474c9f29c65064f9d5134d3fb8963ac85574f5d54b941e913c8d0115a2c9

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