Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c4109c89e7fafd…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 07:57:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 98b4e6c7a7c448cc7ccab3bf82ea2a6a SHA-1: 47e1de9a55f977e1e646c04188d323c5463dcb56 SHA-256: 81c4109c89e7fafdb162021e52ffe0a35de57c7d6811d9bbfa843d62bfd142dc
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a heuristic firing for an external URI, suggesting it is designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/did-momo-hack-roblox-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-free-robux-for-android_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-stuff-for-free-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-a-roblox-server-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/pokemon-go-free-7km-egg-list_GM1094591345.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
stream_004_off00004ff8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF8 27940 bytes
SHA-256: 0af1a730a268c34c9eff4bcdb30bac626935b8e10a29805d0625e43e9d56067f
font_01_sfnt_off00008fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCE 19100 bytes
SHA-256: 7254fefb5f2784eb819f44c3be6f481daf9dac3ab0fe38e4c2de2ca4f997fda8

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