Malicious PDF — malware analysis report

Static analysis result for SHA-256 481cfde863ecf02e…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 06:06:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b3b199ae25061f67ec6caf3f9f0f8ab3 SHA-1: c8def9e874ebd0424f9c4226b3ccfe04431e3388 SHA-256: 481cfde863ecf02efa28a0eb75f4d62445f84c080c5266e02e55326aefee4d0c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' and 'game hack' lures. The primary malicious link identified is http://netcdn.tw/app/431946152/free-robux-hacker-us-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely intended to lead users to a site that could download further malware or harvest credentials. The presence of a download button lure reinforces this malicious workflow.

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/free-robux-hacker-us-game-hack In PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-roblox-giveawayscom_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-games-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/zoo-tycoon-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-workspacve-hacks_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/checkmein-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-hack-with-cheat-engine-64-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-no-password-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-aot-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/robine-roblox-hack_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_off00003131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3131 22124 bytes
SHA-256: a61bec8513949821388870ad3e9c4b0a00ef76f762f57dc89aa5f7f834e510d5
font_01_sfnt_off00006233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6233 18884 bytes
SHA-256: bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8

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