Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6dddd58e2a6fb4…

MALICIOUS

PDF

37.0 KB Created: 2021-06-24 19:44:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 48d02c1a2ed2a2555e032b68e49ff61d SHA-1: 717e7e99e9f43d782f4884fe15aa6f031aad9201 SHA-256: ca6dddd58e2a6fb417e7538991b86cef9707ab622cc59ac370d4425c44b4027f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious infrastructure, specifically advertising free game hacks and currency. The ML classifier strongly indicated maliciousness, and the document body contains text and URLs consistent with a lure for potentially unwanted or malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hacks-gratis-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/yyoutube-robux-hacks_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-meep-city-money-cheats_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-admin-roblox-gamew_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-no-youtube_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-building-hacks_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
stream_002_off000035cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35CC 22872 bytes
SHA-256: a5eeee749d6782da17c5e3b06d1d10a09585c669ef2e0d08c1265ff4622979a8
font_01_sfnt_off000068f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 19968 bytes
SHA-256: 96de9e7e6f6b2ead9f390b6fdb39fafa3226309bde7e0a047719153a98f6e594

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