Malicious PDF — malware analysis report

Static analysis result for SHA-256 8401b8321d99e7a8…

MALICIOUS

PDF

43.0 KB Created: 2021-05-16 22:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0ae1a0289dc4d2df43a71b27543f7e9a SHA-1: 067f8ffc6e7bb4810b8fa566d1392dae01d5798e SHA-256: 8401b8321d99e7a8a109e4e5a07cb6c6925f5cd2ae418e2a328787350db044cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector infrastructure. The document body and heuristics suggest a lure for game-related cheats or generators, which is a common social engineering tactic to drive users to malicious sites. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-link-blogspot-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-blogspot-game-hack In PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-hack-fast-org_GM406889139.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
stream_003_off00004d84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D84 24164 bytes
SHA-256: 2148edd549a39858bf73225b7b3dc3814120784be695cbfb18ca02be9c6d61bc
font_01_sfnt_off000084bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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