Malicious PDF — malware analysis report

Static analysis result for SHA-256 41273a44110c7cc9…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 23:50:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a3a1bec1001e27799cee27c61ad391c0 SHA-1: 6b8a33cc2a71d66c0bc62ecdef7eadf483d5ad86 SHA-256: 41273a44110c7cc9005777c28f5e6324d4b0b2d68781182ad66f202e8367f7d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure of free game currency and hacks to trick users into clicking a link. This link, http://netcdn.co/app/431946152/free-roblox-usernames-and-passwords-with-robux-game-hack, is identified as a malicious redirector. The document's content and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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-usernames-and-passwords-with-robux-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-urbis-hack-script_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/code-for-free-rubux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/all-free-rthro-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/banned-from-free-draw-2-on-roblox-for-no-reason_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-do-you-get-free-roblox_GM431946152.pdfIn 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_off00002e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8B 22204 bytes
SHA-256: 2bda115cd2b5512c13233bba6405c0d927f6125c61fe7dfa1440e3bcc126615f
font_01_sfnt_off00005fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC3 20128 bytes
SHA-256: dfbf61c40164eb587ef48a6858bc13aef2407c6314e30c81c4048209d268a0d7

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