Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a47fb77db86064…

MALICIOUS

PDF

46.5 KB Created: 2021-06-08 15:03:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 927e775a61db8c71ef3e864ddfc1931a SHA-1: c02437c5cd71d2d0e81d4742ba32bfc133893fd8 SHA-256: a4a47fb77db860643bb3cf0ef7fe3f43b8dc6c3ef6ac89dc88b6aa26a72ecf71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games like Roblox. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure of free in-game items suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.tw/app/431946152/roblox-hack-codes-game-hack In PDF document text
    • http://kontaktadig.se/images/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/pokemon-go-free-bot_GM1094591345.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-giveawayxzy-online-hack_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.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_004_off00004e6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E6D 25212 bytes
SHA-256: 2a158446dd6797d234c3264a4899343d1057735191ded18ecb9b99200c4fac27
font_01_sfnt_off00008883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8883 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000926e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926E 18356 bytes
SHA-256: 248f759c619fe1c96c576728ba71c16d7d0933fc88833f740ae7987d47f6eb68

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