Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d74b85c89b4616…

MALICIOUS

PDF

32.3 KB Created: 2021-07-08 00:55:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 91624ebbd7f0de01c92c6974577d3e2b SHA-1: 4f7707b6b929236919ee78322a4baa57000aae9c SHA-256: 91d74b85c89b4616c0c80210828cf06d146ebb41982d2809a3359b822c0835d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'Roblox generators' and 'game hacks'. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing sites. No scripts were extracted, but the embedded URLs and redirector heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-cp-game-hack In PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-roblox-without-a-app_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/como-poner-hacks-en-roblox-en-orenador_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/bux-fund-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-execute-hacks-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/como-conseguir-robux-gratis-en-roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-hacks-free-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-sketch-roblox-hacked-client_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/nike-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/cheat-dbr-roblox-ccv3-2021_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_off00002957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2957 22172 bytes
SHA-256: 62f3576063460d5b5941b1c283a9b41508bb84ad866ed9bbd228d3d4730655c0
font_01_sfnt_off00005a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A54 18664 bytes
SHA-256: ad2375de5567111ace9dcdeb581e255bee5025da315655895a663d8322e40803