Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c17f22c90d3e67f…

MALICIOUS

PDF

33.9 KB Created: 2021-06-19 02:55:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4d78ad5d963a951de4da393f41fb853f SHA-1: 963946c47e0b8f7c6dc0091ef2a9067d09bd8ada SHA-256: 1c17f22c90d3e67fcd4f9f4dea5e99089c6cb2554cf8e795ff4ac784d1f21409
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-robux-robux-robux-obby-game-hack. This redirector is used to lure victims with promises of free game currency or hacks, likely leading to further malicious content or downloads. The document body and embedded URLs reinforce this lure-based attack pattern.

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-robux-robux-robux-obby-game-hack In PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/roblox-hack-robux-2021-pc_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/roblox-cheats-for-pc_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/wwwfreerobuxgenoratercom_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-robux-without-veriufication-new_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/bit-slicer-roblox-infinity-jump-hack_GM431946152.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://pn-negara.go.id/new/public/ckfinder/userfiles/files/free-roblox-toy-codes_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_off00003041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3041 21620 bytes
SHA-256: 9a5b1406ad3efb4201bf1dcf810e50cbe4f004909d6ccac58a59eb505bb9a55b
font_01_sfnt_off00005fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC8 18896 bytes
SHA-256: 6e9f00f662c7d21a362c6f4977b25baee64ea5d1b6302ee915ad89b263504de8

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