Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b4bcf4818a310a…

MALICIOUS

PDF

34.6 KB Created: 2021-07-02 02:06:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b2309d09cb6e766eeecdba0f31aa094 SHA-1: 1e05fc018a94d9cb50a5d515e2af485a2ac6b048 SHA-256: 22b4bcf4818a310a58429692ca485f1ffa8153ca8ce10c38f0ae9b304b6c2c63
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators. The document body explicitly contains the URL http://netcdn.co/app/431946152/free-roblox-toy-redemption-codes-game-hack, which is flagged as a malicious redirector. This indicates a phishing or scam attempt to lure 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/free-roblox-toy-redemption-codes-game-hack In PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/roblox-btools-hack-2021_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/secret-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/roblox-points_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://himalayandiscoverytrek.com/userfiles/files/how-do-i-get-free-coins-on-coin-master_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
font_00_sfnt_off00002f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F35 22148 bytes
SHA-256: 841eceb3abc4754459349f01c090a82022a630ab86a4f836febc40d521a16863
font_01_sfnt_off00006053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 19664 bytes
SHA-256: a82c367e1be7a99dd4a0afc94fbb93cea6071475095c12f8ef1f9a49566b4ebe

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