Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bda5964b66728a…

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 14:37:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89f0b308f40db96f292108a4aeffd0ee SHA-1: af330c67223e45bac30ae55f51ebb1a2fa3eef67 SHA-256: c5bda5964b66728a9aec1e195476e3d11ac28c578627b96f582e7068b2e1fa95
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a primary focus on 'Coin Master' and 'Robux' related downloads, suggesting a lure for potentially unwanted or malicious software. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect users to download content. No scripts were extracted, but the document's structure and embedded links indicate a phishing or social engineering 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/406889139/coin-master-34-4-free-download-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-mr-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/what-is-wurst_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_off00002c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C45 21916 bytes
SHA-256: 70043c0da3af9223079a75f8035612719d8e64de3cf9372503bbfba46aa2f167
font_01_sfnt_off00005cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 18812 bytes
SHA-256: 08b88d86d613c4248f0c9df1bcfb64192a2c502be9f42481700ccbfb949bde9e

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