Malicious PDF — malware analysis report

Static analysis result for SHA-256 83274a68084e3946…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 14:05:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d6626894f9fec4b4b0edea4e873a8587 SHA-1: aa57ef2bac1f7ef5ce2913e6c231dd039525b08f SHA-256: 83274a68084e39467cf5b0899a0259abf2587ca6a2db264b329e8723cefc6f7f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. These links are presented in a way that suggests they offer game hacks or generators, a common lure for phishing or malware distribution. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-website-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-coin-master-free-spin-link_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_off000049be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BE 24744 bytes
SHA-256: 7118571b0a80fd5558a4fc3e2195102b91b498f2ce172afc6ba3e5ea945cffc4
font_01_sfnt_off00008291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8291 17900 bytes
SHA-256: decb0c413fa85b8530be01f527249ec626c34e53c28067a93855c78243a97237