Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48d4c21d955f90f…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 13:37:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9c7d5754d704636ebaddf8069395ad4c SHA-1: 3e48b6ce6c0415d6964377572f12cc38e34fe5d3 SHA-256: b48d4c21d955f90f9fef2f1378abdc1e468999682c59297992c1275d7a868fb9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a document body that advertises free in-game currency and cheats for popular games. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-pin-game-hack, likely leads to a malicious download or phishing page. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the presence of external links and the lure of free items suggest a social engineering tactic to trick users into downloading malware or visiting a compromised site.

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/406889139/coin-master-free-pin-game-hack In PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-robux-inspect-element-no-wait-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-cool-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/hack-robux-cheat-engine-61_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-cheat-on-roblox-piano_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/roblox-cheats-for-hacks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-make-roblox-audio-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/youtude-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/roblox-boku-no-hero-academia-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/can-cheat-engine-get-you-banned-from-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkklawang.com/opac/repository/robux-cheat-codes-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_off00002f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F90 22532 bytes
SHA-256: 03db7b0f07955e6fdeebf078c00452449dc773bf0c2a02bf54a0e3b0b18dbd11
font_01_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 18152 bytes
SHA-256: dc9279c8f9ffb77b5b0b20899b1012281909b59fa7ee038540f0424ab4b7db6e

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