Malicious PDF — malware analysis report

Static analysis result for SHA-256 c556fb494abea832…

MALICIOUS

PDF

33.2 KB Created: 2021-07-05 18:42:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e098b9750e0be40a8f17dff3c7686185 SHA-1: 37b6f70e45974b80a34302ddbab837f91310167b SHA-256: c556fb494abea832e594c2a64a37c4fd7020a99dfbed6a86dcc396f993318124
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'free Robux' and 'game hacks' to entice users. It contains multiple embedded URLs, including a primary redirector at http://netcdn.tw/app/431946152/watch-videos-for-robux-game-hack, which is flagged as malicious. The document's structure and content suggest it is designed to lead users to potentially harmful websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/watch-videos-for-robux-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cch-ly-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-accounts-with-password-and-username-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-1k-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-and-limiteds-hectic_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-100-real_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-servers-for-roblox-super-power-traing-simulator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/freerobuxyz_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-hack-roblox-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/irobux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/mega-hack-roblox_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
font_00_sfnt_off000029da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DA 22356 bytes
SHA-256: 551656028750efc9b393a7a25c467e5e9f47812881c42bdd2e34538ac1ec0ba2
font_01_sfnt_off00005b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B67 19612 bytes
SHA-256: 40ad7de4b9946de06c7051d7b0765d6ae30e92e57daaefd71a8c8f9bb444c2e9

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