Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd26157db33bda3f…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 23:19:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d3b225df7806e10ede373f9351683203 SHA-1: 9f3dc31910be592cf9961fe1e6dbae9cc6c599dd SHA-256: cd26157db33bda3f5c734998ab0dd31f5db3cd310e1789072b0b703a4b0e02b5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, designed to lure users into clicking on offers for free game currency or hacks. The primary malicious link directs to http://netcdn.tw/app/406889139/instagram-free-coin-master-spins-game-hack, which is associated with known malicious infrastructure. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially harmful sites.

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/instagram-free-coin-master-spins-game-hack In PDF document text
    • https://www.vista-design.hr/files/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.vista-design.hr/files/go-to-robuxhackpro_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/how-to-get-free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-robux-computer-hack_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/roblox-sued_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-roblox-gift-card-codes-not-used_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_off00003091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3091 23100 bytes
SHA-256: c2aded292ec639dd226328ac1c60dead40cba0c67d6328b04131ec050ccfb3ad
font_01_sfnt_off000064ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 18432 bytes
SHA-256: 1f2da1675223b6dbd442bdca0602b4e79ac37dfffde3eb4afc1c712a36baf636

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