Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5517f35be428b4…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 09:22:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f6b57b95f44a5b1601ee3a8969b8d0da SHA-1: 94a1455868fb78e6b6b1c921c60f7b5c5f24eb5e SHA-256: 8a5517f35be428b473e3f20ce95026713767e8a4945841a443db1443bb42c0c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a website offering a 'Coin Master Hack'. This lure is designed to trick users into downloading potentially malicious content. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-mod-apk-free-download-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/village-coin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-robux-android-1_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-download_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_off00004e84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E84 24284 bytes
SHA-256: c857bc9a4431c8b04d53397d01dc261da0325bf76590e371c8d21f9ffa763ddb
font_01_sfnt_off00008629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 18636 bytes
SHA-256: f35a088bb389889b7dbdb2955ea981e64c4ac43926c2f49735e1909520ee0b52

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