Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a9c52f7ebd8bae…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 22:44:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 637e4cac973cfe501cafa52e16bb840d SHA-1: a0b88d3c454df687ebb7daf7f1ed988edc44fe18 SHA-256: 06a9c52f7ebd8bae8fc4aa93ece66b4071d23f65273b8aedae76207419d9690d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to a known malicious infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary lure appears to be a 'Coin Master Free Spins Link Download Hack'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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/coin-master-free-spins-link-download-hack-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/codes-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hacks-para-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-download-windows-7-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-one-piece-roblox-character_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/www-play-roblox-for-free-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-cheat-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-upgrade-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cheat-roblox-super-power-training-simulator-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hacks-para-roblox-inparcheable_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-2021-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-without-surveys_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
stream_002_off000031c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C7 23132 bytes
SHA-256: 448faaa157d4017009e447dfb5f3fb38d9e030fd4909c2331d71dcff1cb542ee
font_01_sfnt_off000065ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 18924 bytes
SHA-256: e987de95c71b54d77bff4d31366d2d96c0c1c0c84cc5d45c6fa9b96ee99b38ec

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