Malicious PDF — malware analysis report

Static analysis result for SHA-256 b330ae978c0af54b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 08:33:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a969a7c8b4c26307ae6ebc74aebb41ab SHA-1: fb51c105ff7ac4071079fd6b702b10aeb5247c0d SHA-256: b330ae978c0af54b5e8a3069f7fb42358e44848e9d7a43e9b8b1061a27af026b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, masquerading as a generator for game currency or hacks. The primary lure is 'Free Spin Coin Master Link Today'. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malicious content or downloads.

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/free-spin-coin-master-link-today-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-for-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-promo-codes-april-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/download-roblox-paintball-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-ios-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/assassin-2-hack-roblox-script_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-free-robux-pastebin_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_off00003082.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3082 22976 bytes
SHA-256: 5ebecbb22c19be450f082c4a5ead18774849cfcf354c68fdcec2ff06fb65d139
font_01_sfnt_off0000643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643B 18696 bytes
SHA-256: 999ecdd706d19f0427b49ef661b374c0ed01ce3167435dc1c975e4b6691a93c3

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