Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc22ef35f45b6c95…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 18:35:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99acf9b05295d9f458b300bb0b023ce3 SHA-1: c841f6a2713881d0e72e602f1528ff6a94a01447 SHA-256: dc22ef35f45b6c956539c0eb21f8dc1d3d38f69f769e7755a5732a8b33015299
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising game hacks and free currency generators, which is a common lure for malware distribution. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to a second-stage download or phishing page.

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/twitter-coin-master-free-spins-link-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacks-tool-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-jailbreak-hack-mac_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/como-robar-cuentas-de-roblox-con-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-glitch-easy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pubg-uc-free-link_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-300-robux-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-games-in-roblox-on-ios_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-rich-account-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/boombox-roblox-free-catalog_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-007_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-be-a-jailbreak-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/spin-link_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_002_off00003211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3211 23464 bytes
SHA-256: 1edcf16f8cfc48fec1ef8db9e65358106b3536d64659af31c4202c5e6340e28e
font_01_sfnt_off00006743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 18508 bytes
SHA-256: e996a1c2c749d06335181f09e39a80fe94a553a11d6c3868ca1e004cbb72c640

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