Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce36d31e72c7b4c9…

MALICIOUS

PDF

35.9 KB Created: 2021-06-19 12:43:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 262f9764a5f1f0479ee3a2e89efbb2ab SHA-1: 0b31f557321f027905f7837aa6a4f87b7497ee4c SHA-256: ce36d31e72c7b4c95105ab0dd36ae8891827b670b0112d3b35bc89ca5293381a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. The document body and embedded links suggest a phishing attempt to trick users into visiting potentially harmful websites.

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.co/app/431946152/free-robux-without-human-verification-and-no-sureys-or-downloads-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-free-games-you-can-play_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-apps_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
font_00_sfnt_off000033f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F6 21608 bytes
SHA-256: 19874908d6f5449541e959cdc20a88b495aaf219ec9985635aaf9a472964156e
font_01_sfnt_off0000637a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 20456 bytes
SHA-256: 8e9733a2f13d962d02107d212ea5cfb1bad61c490829620a9a1b0da57435c92e

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