Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff51a907554d3a6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 09:19:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cfa19cbba6806c64273d8c1d90346478 SHA-1: 65e6d812467fa641960e1c2e809ca693943aca89 SHA-256: eff51a907554d3a6c14788361049d21e7b164c974b4f12897ce907fba38b5b65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free currency, directing users to a known malicious redirector. The embedded URL 'http://netcdn.tw/app/406889139/free-spin-and-coin-links-game-hack' is a critical finding, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

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/free-spin-and-coin-links-game-hack In PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/robux-survey_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/telecharger-hack-pour-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/robux-cheat-2021_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/vdeos-de-los-mejores-hackers-que-hackean-cuentas-en-roblox_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/pastebin-roblox-vip-free-robux-no-wait_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-rs-roblox_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/how-to-hack-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sharmagoa.com/uploaded_files/userfiles/files/roblox-jet-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000307a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307A 23628 bytes
SHA-256: ce8bc92b056a0278c5cf1846f0fb426734649a56b50498aa01a7d2827e983716
font_01_sfnt_off00006654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 18412 bytes
SHA-256: feaedb9a78559dc6a64089415154926f3ccc0cd0c5c4fca7e150a72d524e2070

Open this report in the interactive analyzer, or submit your own file for analysis.