Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5521da4ee4c13b7…

MALICIOUS

PDF

35.3 KB Created: 2021-06-28 15:18:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fa69e49052d23f61370dda87de1a7891 SHA-1: a9ea8e3609d6e03b6ba1da76419bbed99c0baf2c SHA-256: a5521da4ee4c13b7ba8effbd10fd923b9ddf9b88a467849757f967e3b9c4d5d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on offers for 'free Robux' or game hacks. The primary link redirects to malicious infrastructure, indicating a phishing or scam attempt. The document's content and embedded URLs suggest a social engineering tactic to drive traffic to potentially harmful 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/hack-free-robux-2021-game-hack In PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-no-hack-on-phone_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-make-a-hacker-game-in-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/natural-disaster-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hackear-ordenadores_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pokemon-go-free-bag-upgrade_GM1094591345.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tiktok-free-roblox-accounts-2021_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/cool-hacker-names-for-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/boku-no-roblox-free-spin-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-xray-hack_GM479516143.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_off000032f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F1 22196 bytes
SHA-256: 6f08e97f50e10d5ffd9e2969a7c721b7c54bd5ac68ff49f1c581e0b43896b639
font_01_sfnt_off00006453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 19288 bytes
SHA-256: 529325f507abbf5ed777c80188435d2f5ec0e12fe452e45ce6d7c301aaa9e34e

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