Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f613ddfb8aa29f…

MALICIOUS

PDF

34.1 KB Created: 2021-06-24 01:47:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76dac02bf0f63f8eae674ac43b4a03bf SHA-1: ec9f1e2a4123860d5f12b3cb7e7900bf83ba2d8d SHA-256: 90f613ddfb8aa29fc4097bc3af3cf13bfa0613f4903346804727f34733d96c31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free item generators. The primary link, http://netcdn.co/app/406889139/legit-free-spins-coin-master-game-hack, is identified as a lure to a malicious redirector. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or malware distribution attempt.

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.co/app/406889139/legit-free-spins-coin-master-game-hack In PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/injustice-oa-roblox-hack_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-hack-a-person-on-roblox_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-cattlog-roblox_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-devil_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/pubg-uc-sale_GM1330123889.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-for-coin-masters_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
font_00_sfnt_off00003032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3032 22720 bytes
SHA-256: 459de959e02a56c7d65d86cf4077bf2aca69b963e17de3d3b91b2459f52d783d
font_01_sfnt_off000062ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 18176 bytes
SHA-256: 306c3b6095d1991059b25385d3e7cac4e1613d3ee958be56c36e50ec503f6c94

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