Malicious PDF — malware analysis report

Static analysis result for SHA-256 764f0ad59a3cba58…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 14:49:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8c17183de8886ee81ad78e933ab25c4 SHA-1: 8d32004d82fc3ca8cfb66f1a9eade1cbe6e9984a SHA-256: 764f0ad59a3cba585f5dd90665a5bd5fb3017b3b19904e938a521b0673e9c8a4
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and generators. The heuristic firings indicate that these links lead to known malicious redirectors and are designed as a lure. The document body, though heavily obfuscated, contains references to these lures and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/479516143/minecraft-pe-apk-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-often-pubg-uc-appointments_GM1330123889.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-116-apk-download_GM479516143.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_004_off00005287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5287 25168 bytes
SHA-256: 5fbbd4bdb7ea0bd55afacf278909f0a274bf75983723fa9c0754058c6501ba30
font_01_sfnt_off00008bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC8 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000957a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 18068 bytes
SHA-256: 5fbed8632119c253af4b9ab7dc246da20067eac7641579129df9e72f6a1f5ea4

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