Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa864e7c1b93175…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 13:15:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a9b62ec98db5049a7da6a17c65e46707 SHA-1: 352f135bde144c31fecfc95b9eb3d77926e8fdaa SHA-256: 6fa864e7c1b931750f6c3cfaf1e65375975eaa9d9fbd2f9787a28223ad707503
200 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks and free currency. The document also includes a lure to install a browser extension or update, which is a common social-engineering tactic. The presence of these elements strongly suggests an attempt to trick the user into visiting malicious sites, likely for credential theft or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.online/app/431946152/roblox-free-clothes-codes-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/sentinel-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-gen_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_004_off000054c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C5 26008 bytes
SHA-256: 1828938bc03d390d6c193431e1af3f3b892b5689cc3e6632adc369c5010e360b
font_01_sfnt_off000090d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D3 18392 bytes
SHA-256: d8b17fa3f29c5fc3b2ca0cecc93d61ab3a50b68dc1f93f0739daeae1c5528549

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