Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44215a31e862a36…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 06:48:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8d571493fb7c56c6506f82ebf28a186b SHA-1: 810097e93c3561e1ddee343f88ded1a5fb78b0ba SHA-256: a44215a31e862a3669020a758f6e169093fa498075a08085b904bd5c6a4427e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that point to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The document body reinforces this by displaying the same URL, suggesting a social engineering tactic to trick users into visiting a potentially harmful site. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or scam attempt.

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/daily-free-spins-on-coin-master-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/donttazemebro-roblox-person-hes-a-hacker_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-free-gift-card-ord-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-robux-hack-february-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/ho-to-get-free-glowing-skirt-on-royale-high-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hox-to-get-free-item-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/boku-no-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/wwwfree-robux-todaycom_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-coin-master-game-2021_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_off00002e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E75 22856 bytes
SHA-256: 2ab58a5bf44b84ef0caaee18044e2b2278dc6b0a8ae8aeffab5e1f7f287e6d32
font_01_sfnt_off000061e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 18596 bytes
SHA-256: aa492e242eac48f7948a24bc45da02f981899f459ecbb02c793d9ace75e48389

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