Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62b866c79af20cc…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 03:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1091b678d680e2383a64a362e03eb592 SHA-1: d299252ed3cfe34562604dfbd60346d95173a733 SHA-256: f62b866c79af20cc5d193af04c8fc7f9ad6809416d989d63bc744921a600960a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The document body, though partially corrupted, contains references to these lures and the primary redirector URL. The ML classifier also strongly indicated maliciousness. The primary attack vector is likely spearphishing, with the PDF acting as an attachment designed to lead users to malicious 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.co/app/431946152/roblox-free-for-all-area-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/19-diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/fake-gps-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-get-free-robux-on-mac-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/fastbucks-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-no-downloads-no-surveys_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/whats-robux_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3148 22792 bytes
SHA-256: f63f551e8b196ac0ba7003ec27c6c268f62587781534581e0380447c7d7dc0d3
font_01_sfnt_off00006486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 18652 bytes
SHA-256: 5fcd0c994e0c6bf3aed5389404176a6fcd45e640de008c272e95b4de0d011a1f

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