Malicious PDF — malware analysis report

Static analysis result for SHA-256 4109c3e480a0be9a…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 05:47:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a5f0cf2e32163e4a2cc21d8853797a14 SHA-1: 6a710c345b73db2a71d6c74fe0ea2fee2e457d0a SHA-256: 4109c3e480a0be9a56171700fd07a28169473d4ebd3aa3beddad26d6d4cac06f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/www-free-robux-com-game-hack PDF link annotation
    • http://www.salwangurgaon.com/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.salwangurgaon.com/files/free-coin-master-game_GM406889139.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_003_off00004951.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4951 25384 bytes
SHA-256: 57eb8fac289c2eb2831f489e424414297f737d27bd4fefb4c054b2c0f498bf30
font_01_sfnt_off000083dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DC 18636 bytes
SHA-256: 9f7262e815bd0044d2d3715e2ef4b4760a787eb7fc9de28673ce11fb32ae2f7d

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