Malicious PDF — malware analysis report

Static analysis result for SHA-256 259ec98ae95cdc55…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 05:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4e0e76bb92ce84eb85a9fb3e7154973e SHA-1: 64c56d73995cb46e78f1063adea1d76d326a5565 SHA-256: 259ec98ae95cdc5526a1191cea7f0352d577854806e8d513c9eb5b6f2844a73f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector. The embedded URL, https://netcdn.tw/app/431946152/roblox-cheat-engine-bypass-august-2021-game-hack, is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-cheat-engine-bypass-august-2021-game-hack In PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/pubg-600-uc-free-redeem-code_GM1330123889.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/cheat-super-training-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-skins-pc_GM479516143.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_004_off0000530f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530F 26832 bytes
SHA-256: 0fc2dd5786aaf97fd2b4b1f5d92d3656307f44fda6047e8107ccc08b6dc54799
font_01_sfnt_off00008e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8C 19588 bytes
SHA-256: cef58d600a399742e2d78e2c477c308deb82520e9262bdac06b99da98ec675b7

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