Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b53fb22d4918e…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 16:31:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 07fadf6277fa5cc1eeee2db69d98b368 SHA-1: 87ba0c66bf3a240e779b13764644a00f833fec97 SHA-256: ef6b53fb22d4918e36ab37c555c911829128a5a203881fcaf1cfc7ca2146ad02
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users with lures for free game currency and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lead the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a second-stage exploit or phishing 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/bloxawards-com-earn-free-robux-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/do-you-get-free-robux-with-builders-club-2021-bonus_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-amievenalive-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-cheat-engine-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-roghoul_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-halloween-costumes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-into-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-raffle-and-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/what-do-points-do-in-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_off0000328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328E 23276 bytes
SHA-256: 7564b042bf67a74c6af8d4504c20375a2bbf1a513e614fcc05814527864cc881
font_01_sfnt_off0000671c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671C 19388 bytes
SHA-256: a49c25f28f0590689f8af739301bd5ad68501f9ff3aeb4e7e8a2cf9cf428bc40

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