Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401dfb60cc3f7df…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 16:45:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 86109571285b6174a2a405f7f37ef830 SHA-1: ffcc7392dc599b5b975e05bd4198491b8815725e SHA-256: f401dfb60cc3f7df5fcb6f5edf914a70737d81507552bee70fa3931a1584e526
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which redirects to malicious infrastructure. The primary link identified is https://netcdn.tw/app/431946152/how-to-get-free-lua-executor-roblox-game-hack, associated with a 'free generator / game hack' theme. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-get-free-lua-executor-roblox-game-hack In PDF document text
    • http://www.e-lysis.com/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/bloxorz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-likes-and-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-robux-no-verification-needed_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
font_00_sfnt_off00005388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5388 25740 bytes
SHA-256: ceb9154fbfd87a6989a0bca81a1366d9e207046ce87e0da29a8d6ce4ca04dfa3
font_01_sfnt_off00008e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000099c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C9 18584 bytes
SHA-256: a3f2c01867be713d92ca1c38d5baede68c7fc56b0452c069f1b5e31af9b5abb7

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