Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7c945db0d7c9d9…

MALICIOUS

PDF

46.7 KB Created: 2021-05-12 17:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 72b5abe2fc45aaa071b2b661f0ba8d6b SHA-1: 714c0ef5f5905a55fa8bc5cb9b849d612fec9a4e SHA-256: aa7c945db0d7c9d9b459b6f2a0f47e4197dc566c9fcbbf4db828ba9285d206de
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/431946152/free-robux-2021-no-human-verification-game-hack PDF link annotation
    • http://118.98.227.172/opac/repository/coin-master-spin-link-free_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004788.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4788 26636 bytes
SHA-256: 694feb8ab7ef43ff2a76ab44ed49d4a55fa0d670d879b7fdacbda6d9b91efef8
font_01_sfnt_off00008419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000912b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912B 19260 bytes
SHA-256: a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac

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