Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90dd6b3a0aa9892…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 08:03:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ba5a9aaf0ff67fade85b05a5e979844d SHA-1: 877d5dd040b511145c82bbef57bbdf429f5a20b4 SHA-256: a90dd6b3a0aa98924ff76c8727893fbe4f4086669ca80dab0c0a61d1bb95b6b5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious intent to redirect users to potentially harmful content.

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/robux-win-game-hack In PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-hack-past-2-step-roblox_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/best-hack-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/roblox-free-shirts-2021_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/roblox-sex-cheat_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/roblox-how-to-get-any-gamepass-free_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/robux-maker-hack_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/2021-free-robux-daily-website_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/enter-thsi-pin-to-get-free-robux_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_off00002e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2F 21688 bytes
SHA-256: 64307bcf73d92a0702d6673c74886028cc18a8fd04bbb974be277c79b8cf244e
font_01_sfnt_off00005db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 18868 bytes
SHA-256: b7886f95459917ce9979ba5e88b3e17eca9525d8377d3e247e9b6fd470620a4b

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