Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaf81a4f57b83ed…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 19:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 70adf6dfc3dd4b9a6625ddb05fe92f92 SHA-1: 9aa23b90af6df18db59314a2aa276626c22d419f SHA-256: cfaf81a4f57b83edf68e9c7fab3ca4cc2443be61d37ca5fd79c0f7160e2847fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence indicate a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/479516143/free-minecraft-windows-10-account-game-hack In PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ugericabs.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.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_off00004d23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D23 24852 bytes
SHA-256: 04f72cce92f5cd99c3a57eb983f1239597bda7f58ab330cb5397f5801a6d76af
font_01_sfnt_off00008588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 18664 bytes
SHA-256: 0667defd5b981729aa81a804935fb7ded52a2ddc2e462daaea0df5db4134a477

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