Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4ab8367fd04569…

MALICIOUS

PDF

41.7 KB Created: 2021-05-11 03:30:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: df020fd2d159ecc6f798b8151e1d2049 SHA-1: 0e19d005b9ca8d58d46c9bbaefbed334680f4a38 SHA-256: ff4ab8367fd045695cbe01b06dde51e7ecbe74678f25d47d76bbaac12e33b19c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary redirector URL, https://netcdn.xyz/app/406889139/apk-coin-master-hack-game-hack, is identified as malicious. The document body, though heavily obfuscated, contains references to this URL and other similar PDF files hosted on ktn.com.br, suggesting a campaign distributing malicious links under the guise of game cheats. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/apk-coin-master-hack-game-hack In PDF document text
    • http://ktn.com.br/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/rbx-free_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ktn.com.br/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://ktn.com.br/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://ktn.com.br/images/how-to-get-free-robux-without-download-apps-or-survey_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_003_off0000490e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490E 24544 bytes
SHA-256: 35dd73e89746c177e28a3f41ad616479fb2f4064d32e011842ad8274bdbccbbd
font_01_sfnt_off000081bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BF 17892 bytes
SHA-256: 10848dcb94fa8ef52647dff51f313a82fe0a75c442c4a6ae41e72789ca7f1d9e

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