Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b719d0f392500b…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 11:56:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bcb4dcb96269ba691c664454178d3739 SHA-1: 6c0a8c7176c2a8010942e7848eb82d1d4efdb289 SHA-256: b7b719d0f392500bf85571dbd56debc531214c92f148552746835c3683a16067
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a "game hack" lure, specifically for Coin Master. The primary link redirects to malicious infrastructure, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious.

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-free-daily-spins-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/tiktok-free-unblocked_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mathep_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/pubg-50-uc-free_GM1330123889.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-app_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_004_off00004f00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F00 25196 bytes
SHA-256: 3830a766b8c6e135999d94fc3c2c438b54c34583c4680f289ad8070488e5fc7a
font_01_sfnt_off0000883d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 18308 bytes
SHA-256: 5c3cefeee4a209382fad51155f4ab19c665f35dca270fe96ae1b58d23c3d8f95

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