Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2265faded1c8c3c…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 08:28:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8670a50ad15193e02c01e1f870394b71 SHA-1: e87493f8c234758b01ab18834e88a4eb2d90653c SHA-256: a2265faded1c8c3ca854889db917718c8e5559bb7d180bb3c1224b42257b1dc1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'Coin Master Hack'. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. Although no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/406889139/coin-master-hack-using-lucky-patcher-game-hack In PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-tiktok-followers-generator-no-human-verification_GM835599320.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/pubg-uc-online-hack_GM1330123889.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-heaven-free-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
stream_004_off000052a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A8 26640 bytes
SHA-256: a0f047809335d602ba84df42e5b88ee40a56d449763e3dc5ff25fb6c679e6da9
font_01_sfnt_off00008fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB3 18832 bytes
SHA-256: 2cd4bfabdd56e5db7574a9ce92a7cad7f1521c02cad56c3759cae2546db8459f

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