Malicious PDF — malware analysis report

Static analysis result for SHA-256 31813468d3e00062…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 05:26:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 226964a435fbf8a849a16757d80df2f7 SHA-1: 7ca54df313244434df8e2ade53f43cec8bf1c09a SHA-256: 31813468d3e00062c95c6e003d7f65768f6ebb47aad723001243b03dff28bc5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The document body and heuristics indicate a lure for users to click these links, likely leading to malware download or further phishing attempts. No scripts were extracted, but the presence of malicious redirectors and the lure suggest a phishing or malware distribution campaign.

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/479516143/minecraft-hacker-skin-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-grouos_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/tampermonkey-robux-hack-that-works_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/20210-robux-free-scam_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-copy-others-chat-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-island-royale-script-2021august-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-speed-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-robuxgg_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3153 22364 bytes
SHA-256: d4b7757c03f75b81bf76a5f80bbedc17a59e167fdfda92862bc12df7253cfe01
font_01_sfnt_off000062d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D8 18024 bytes
SHA-256: a7bd85aded9e794133e08073d83a45875edf97b13575354264ab13ae1688af66

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