Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa25dc372ec8ad0…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 01:03:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8ba9839281d7032d359765a9abf796d4 SHA-1: 1bb8b9726c4d06896c52c578bdfc138d65f9b74c SHA-256: 4aa25dc372ec8ad0229f0ef3cd87eb542a20d4eb6ddfeef565b24e0910280c48
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a website promoting game hacks and free generators, a common lure for phishing or scam operations. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of malicious redirector links and the lure content strongly suggest an attempt to trick users into visiting a potentially harmful site.

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 https://netcdn.xyz/app/406889139/coin-master-400-spin-link-today-game-hack In PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/install-coin-master_GM406889139.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/latest-coin-master-free-spins-link_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
stream_003_off00004c0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C0B 28912 bytes
SHA-256: 29a3453fcd1f166c23f08a7c53f947df9093251aaa3ff8a230ec1982f728f371
font_01_sfnt_off00008c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 18480 bytes
SHA-256: dad02a5aef0ea5dcf7b1fe658ab5d5874ad8a27366cac98dbe4b862ee070bc87

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