Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8002cbbf361354…

MALICIOUS

PDF

47.7 KB Created: 2021-05-14 17:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f9c348e594f649e4ae817494a313ffe0 SHA-1: 4cc0fb4dc84208f44efb0d5efc9be6c2944e73ba SHA-256: af8002cbbf36135440af2371e28486603e84f7a5f6d62e510b1842c89c24f9b7
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency ('Robux') and presents a fake CAPTCHA to trick users into clicking malicious links. The primary link, 'https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-2021-game-hack', is identified as a malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/how-do-you-get-free-robux-2021-game-hack In PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/freerubux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-link-2021-no-verification_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_off00004b2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2B 34040 bytes
SHA-256: 7adb7a821104ef3107cf94e505d8f5caacf7041a0fed4f3f132f956f17b377dc
font_01_sfnt_off00009650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9650 19016 bytes
SHA-256: 7afc4835c6f8d200a546e15f78f642ba5dd88c8fac7df04bc3003dd1e9f7232a

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