Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4899dfa0e5e002f…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 22:33:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a1edbf46406658c6544e601cf65c4b14 SHA-1: 97815d3052ec6aac005ed14bfa23db2d05bb52e0 SHA-256: a4899dfa0e5e002f6d2fa6ecfd9c3e5e284de65d14400af0a102719a8f2b3cdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/www-robux-redeem-game-hack. The document body and extracted URLs suggest a lure for free game currency or hacks, likely intended to trick users into visiting malicious sites. No scripts were extracted from this sample, but the presence of malicious redirectors and the lure indicate a phishing or scam attempt.

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.tw/app/431946152/www-robux-redeem-game-hack In PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/roblox-base-wars-the-land-cheats_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/synapse-roblox-hack-price_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/omg-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalahsan.com/__statics/gudangsoal/files/free-unlimited-robux-on-roblox_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_off000030a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A8 22616 bytes
SHA-256: 6023864761bc0079e6e498bf6a11a709e47e493c48831f37e84535c507ad5d08
font_01_sfnt_off00006302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 19348 bytes
SHA-256: e5280512b7610ecbe9f35059f51f4ace511a0f2c0ebbedb7d74ee2ccbb0f8402

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