Malicious PDF — malware analysis report

Static analysis result for SHA-256 86222cec5bb070b3…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 15:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1311c24b5669f360a81c87d5b05b9df3 SHA-1: 92bedfc0c564a1d8a756d99326553b79b6d73e99 SHA-256: 86222cec5bb070b307cfc46ff3b40f51500af2b3e36a841ee58be2c060afbb97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as game hack generators. The primary redirector, https://netcdn.xyz/app/431946152/roblox-sign-in-free-game-hack, is designed to lure users into clicking through to potentially harmful content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to malicious websites.

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/431946152/roblox-sign-in-free-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-and-coins-app_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_off0000488f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488F 25016 bytes
SHA-256: 3b0ba666f64f3c9d76a1e2ffff551548742d3e81580e592e96143a16ba4fc2ca
font_01_sfnt_off00008198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8198 18356 bytes
SHA-256: 0c6b136d59097e1a689858911fb48c20bb16f920676ba78856ab345b09e68bef

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