Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d9c8bd1f139c9f…

MALICIOUS

PDF

42.4 KB Created: 2021-06-04 05:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0109df7e4c9c8f60df6df40b39e0c692 SHA-1: 79e6d198e0b9de3377b9c24a1a93d8846ac53ede SHA-256: 20d9c8bd1f139c9f1d686b30923e8ec9839e4ff40ebf04e6739a879f140acdca
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as 'free generators' or 'game hacks' for popular games. The ML classifier also flagged this PDF with high confidence. The presence of embedded URLs and the lure text strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/1330123889/pubg-uc-free-link-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-tiktok-engagement_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/are-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-2021-no-verification_GM431946152.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_004_off00004b1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1F 24692 bytes
SHA-256: b74bb84361f3c8df5edd8d7a865c0d340b2acfae1454ca7b464bd2a247c2cc4f
font_01_sfnt_off00008302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8302 18352 bytes
SHA-256: a3e85e0c9ccddadca7ad7cf889982c76c40f50b8fe460afc8fb260ee91d4be24

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