Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fe4fe1ba81539d…

MALICIOUS

PDF

33.4 KB Created: 2021-07-21 02:02:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 54c8881a748ec63ee538212cc439d9b3 SHA-1: 56f6f8aea7d24164c3c57c4dec401d28b4f3e73c SHA-256: 22fe4fe1ba81539d1bd55c94be06201fc9e863ccdc802ef985cd01d138537af1
180 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors and IP addresses, masquerading as game hacks and free in-game currency generators. These links likely lead to further malicious content or downloads. The document body and heuristics indicate a lure to exploit user interest in obtaining free items for games like Roblox and Minecraft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.tw/app/431946152/how-to-hack-peoples-roblox-accounts-game-hack In PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfPDF link annotation
    • http://110.78.114.242/ckfinder/userfiles/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.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_off00002ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA5 22556 bytes
SHA-256: 3607414eff4b3757a533c2cf105983b94569105f900e919665b2bbd204244ad8
font_01_sfnt_off00005dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFF 19108 bytes
SHA-256: 3cca992b89e738ca0e0fc5d204c59383ee6ad597b33237d2d42885b29afa3b03

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