Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048a55cd3654ab4…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 07:27:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dc46487dadbdf7042df4129a25cc74f2 SHA-1: 7321d37a83c6003d5deff2da23626bcec86c7ab6 SHA-256: c048a55cd3654ab4dac719c3d819d9d43906d7d207bd29ee771c5cff6f5ac7aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as offers for game hacks and free currency. The heuristic firings indicate a malicious redirector lure and a general ML classification of maliciousness. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/www-free-robux-com-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BB 25596 bytes
SHA-256: 6a901950c5cf90f03460f8143cd03b6a8073a268890c02a854d09faafef6a740
font_01_sfnt_off00008d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A80 18636 bytes
SHA-256: 9f7262e815bd0044d2d3715e2ef4b4760a787eb7fc9de28673ce11fb32ae2f7d

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