Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bb81e3389f6669…

MALICIOUS

PDF

44.2 KB Created: 2021-06-13 22:10:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 705c8c4a5f97b1198156b48798c34573 SHA-1: 5fd6a9dbe01c43c26662a4e8254c8803276ca98b SHA-256: 99bb81e3389f66694eb39d101578f908990243f21b6c10baf6b0e0ae4ebf25af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and redirects users to malicious infrastructure. The embedded URL `http://netcdn.co/app/431946152/descarga-de-roblox-hackeado-robux-game-hack` is identified as a malicious redirector. The presence of multiple similar URLs suggests a phishing or scam campaign aimed at tricking users into downloading potentially unwanted or malicious software.

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.co/app/431946152/descarga-de-roblox-hackeado-robux-game-hack In PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-robber-hack_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/tiktok-free-to-watch-online_GM835599320.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/the-easier-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/can-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-coin-flip-hat-hack_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/get-free-spins-coin-master-link_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_003_off00004bc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC8 25840 bytes
SHA-256: 3297021e4f5473afc3fb4215e73c1b1bf75f693f738750dab326863dbcc2a143
font_01_sfnt_off0000886c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x886C 18952 bytes
SHA-256: 870295d6ddbcc43a2ef4c84af22bb820c49f67d524cf47a3e501bcf5b06f9d9c

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