Malicious PDF — malware analysis report

Static analysis result for SHA-256 298c132fc85a3f69…

MALICIOUS

PDF

47.4 KB Created: 2021-05-13 08:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2dce2915cc8bb97e1aa5a0d06e3f23e5 SHA-1: 08c044afe2c2b41bf21f0e671cd064ebd2d8d7e8 SHA-256: 298c132fc85a3f698dc6c18cb1e89ea6cda096d3f070734d7f9310edf73e0077
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious infrastructure, specifically advertising free game hacks and currency. The document body, though partially corrupted, contains text related to 'Free Robux Hack' and a URL matching the malicious redirector. This indicates a phishing or scam attempt designed to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/431946152/free-robux-hack-us-game-hack In PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E84 25388 bytes
SHA-256: bc12b518e7fecb5e3326f6e8aea476d5fef1dc8e82046adfd81c1ccc794e1cc1
font_01_sfnt_off0000897b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897B 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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