Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd4633a3cc4e86…

MALICIOUS

PDF

42.6 KB Created: 2021-05-19 01:45:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d0d16851c91ec43b055d37d9979d7259 SHA-1: 7397083c99e0a231e0b1cd50a32f5957c5926018 SHA-256: 19cd4633a3cc4e86d0261b4fe861b42975c90143dd84d7f07c6e73257562ebc9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The presence of these links and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-exe-game-hack In PDF document text
    • http://lib.unar.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/robux-game_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/android-coin-master-hack-2021_GM406889139.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
stream_003_off0000480a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480A 26468 bytes
SHA-256: 90ac6ee153c3280543226f9fd6fa80d6875817595772be55993150f0f4311fbc
font_01_sfnt_off00008532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8532 18012 bytes
SHA-256: 1e3fda203f08fe42ab00f6cef97e605bb68f7e374108f28afe3c353055d0c9d6

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