Malicious PDF — malware analysis report

Static analysis result for SHA-256 9608db9e716d4e4e…

MALICIOUS

PDF

47.6 KB Created: 2021-05-11 05:35:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 611adc41ffe73060c495b7bbb4191c17 SHA-1: 79b152f6c451ee3f2b58c470fd17ea8c7f639abe SHA-256: 9608db9e716d4e4ecafc0e038e58720dc5d6b691dd4c79410a1fb3927637c8d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators. The primary URL, https://netcdn.xyz/app/431946152/roblox-svg-free-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. No scripts were extracted, but the presence of malicious links strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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-svg-free-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/no-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-2021_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
stream_003_off000048e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E2 27092 bytes
SHA-256: 9973ee01b8611eef85f5831202043c49302da7d61b3d7bc54382f70f0c66cc2b
font_01_sfnt_off0000860f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860F 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000977f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977F 18348 bytes
SHA-256: 82620550cff65874d98c2836b8a60b7f72357efbb651992cfb4f65634f65914f

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