Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f6d041852a0ed7…

MALICIOUS

PDF

34.2 KB Created: 2021-07-08 19:49:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bb96c92417106c62f4ec799316c60d89 SHA-1: c866912b47d153306ff61dbd79019330864b9d78 SHA-256: 51f6d041852a0ed7783d317d3108533f8ac386aaf93e7d0da6ba6208af8afa35
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The presence of a visual download button and the lure of free items suggest a social engineering tactic to trick users into visiting these sites. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

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/406889139/coin-master-spin-cheat-game-hack In PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/rainbow-orange-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/dungeon-quest-hack-download-roblox_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-download-and-play-for-free_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/adfly-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-bin-hacked_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_off00003084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3084 22596 bytes
SHA-256: b2e97d8fa5700d91cec200b9ce00ff33f4ef5753493de59907a5dffe2b9a5f2f
font_01_sfnt_off00006315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 18176 bytes
SHA-256: 3199fee58fbf128b0b7204f9060370fea0cf5ccd916deac964171f15d58e92c9

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