Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f479e830f08a23…

MALICIOUS

PDF

27.6 KB Created: 2021-05-10 19:24:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f038ae8f0fa802cbbcec8164686c805d SHA-1: 314740bb63178968d5116df430393b74c3a5d35f SHA-256: c8f479e830f08a2357577e6c000a072a0eb1b255631ac600e538946cefbeb37e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts other malicious PDF files. The document body and heuristics indicate a social engineering tactic to drive users to download or access further malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9759

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/rbx-roblox-game-hack In PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/mcpe-com_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/roblox-hack-me-robux_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
font_00_sfnt_off0000224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224B 19316 bytes
SHA-256: 1d574927451c068ee8f2f04d4fda0ce49980a3c377c984933bc02d8831c7c3c1
font_01_sfnt_off00004a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9F 17784 bytes
SHA-256: b5f4a847199c5858993cc7b96674f5fc7fdb993d36e54c452d2822089e03f31f

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