Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bfcf82cd1c0439…

MALICIOUS

PDF

33.6 KB Created: 2021-07-09 04:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 071e7a3b47cead400ff8a09fea79771d SHA-1: eda83d32dbf4ac4a01386dd3861d7e50d0d3912d SHA-256: 83bfcf82cd1c04396e8ee086c1b12b0d0cde99c7b5b762ecd399d8cd1dd1def0
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency' lures. The primary redirector URL is http://netcdn.tw/app/431946152/roblox-hack-download-game-hack, which is associated with known malicious activity. The document's structure and embedded links strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/roblox-hack-download-game-hack In PDF document text
    • https://www.croatia-flyfishing.com/files/tiktok-watch-free-movies_GM835599320.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/best-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/robux-redeem_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/cheat-for-mac-roblox-safe_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-in-roblox-freeee-worksss-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-roblox-money-no-verification_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/robux-sign_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-actually-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-no-human-verification_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
font_00_sfnt_off00002c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1A 22232 bytes
SHA-256: ae35e7235d230919d3c7df58c8e2f5c53f604ca5397b4e20772b84bac2432f32
font_01_sfnt_off00005d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 19160 bytes
SHA-256: 20e8ef43e122870d61f5f3bdc7785651657b4c6f8223466300bbb50b4def8f00

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