Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd3cb0734549f0a…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 21:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 993cda1fb24814dab9ef2a3f6bb2f253 SHA-1: 3fb7bb7eeceb638dcece936c5cef89a73f304ea8 SHA-256: 6cd3cb0734549f0aab055586fa473afaba331c1f57b2fa1a10d9a711473fe7fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and potentially malicious content, disguised as game hacks and free currency generators. The primary link, http://netcdn.tw/app/406889139/links-for-coin-master-free-spins-game-hack, is flagged as a known malicious redirector. The document body and embedded URLs suggest a social engineering lure to trick users into visiting these sites, likely for financial gain or further malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.tw/app/406889139/links-for-coin-master-free-spins-game-hack In PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-redeem-codes-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-redeem-robux-free_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/is-tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-tokens-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-legendary-egg-in-roblox-mineing-simulator_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/pokemon-go-free-mewtwo_GM1094591345.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-robux-no-verification-or-survey-100-real_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.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_off00002ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF0 22340 bytes
SHA-256: 145e7a3b5c824f7e3ebabec8fa77120023df32bcdcc2b07d3c26046d4463e42b
font_01_sfnt_off000060c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 18344 bytes
SHA-256: ac780784a52fa17aee09141020d6f9167448c06f091de56003ac8032d7c369cf

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