Malicious PDF — malware analysis report

Static analysis result for SHA-256 e143227ec741cb35…

MALICIOUS

PDF

41.5 KB Created: 2021-05-15 11:23:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb5888ae6d4903e2788b2722da6cb3e0 SHA-1: 666c8ec1d4914b83818d90b2781f0d13a302004f SHA-256: e143227ec741cb3585dfd04ee872b2f9e38601ad84897a76387b943557a17762
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, aiming to trick them into downloading further malware or visiting scam sites. The embedded URLs, such as https://netcdn.xyz/app/431946152/free-robux-codes-game-hack, are designed to exploit user interest in free game currency or hacks. The document's structure and content strongly suggest a phishing or scamming attempt, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-codes-game-hack In PDF document text
    • http://foo.com.tw/files/static-moonactive_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-codes_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-game_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-coins-coin-master-blog_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
font_00_sfnt_off000047d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D2 24464 bytes
SHA-256: b722d046fd0933f5dab6ceaead498f45d8daa37251fa1476e566f98fa4abc5c8
font_01_sfnt_off00008016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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