Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7ad7b9356b06a9…

MALICIOUS

PDF

31.2 KB Created: 2021-07-19 06:23:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d9bf2117241ac3f21927b9ceff328ef7 SHA-1: 34e449f3bb3fe39d393d921a8f3fff628f0da567 SHA-256: 0f7ad7b9356b06a9b3919cfda4394d34f9ffd238606e94eda18f8e9798a4eeff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/479516143/minecraft-free-online-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering lure designed to lead the user to malicious content, likely a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/479516143/minecraft-free-online-game-hack In PDF document text
    • http://www.visiblefilm.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://www.visiblefilm.com/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-coin-master-coins-and-spins_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
font_00_sfnt_off00002a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A60 21700 bytes
SHA-256: 91ac4d954914ad7a229699ce589196d96ab59eca87109af90ebd2293fb7e52ed
font_01_sfnt_off000059e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 17644 bytes
SHA-256: d3a8b3d8bd2249c6206e1557dca74d08ec9c3b58c2328dc4779a04ae87c22ca2

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