Malicious PDF — malware analysis report

Static analysis result for SHA-256 905339f663adf4b7…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 20:49:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7028455e38d995bea2e57d00236bd5f0 SHA-1: 00961a187ce373bf72e8e9f3c9f5494649953da6 SHA-256: 905339f663adf4b725bec9756040050ae0b53f9b717e2437c95a4bbe21752cc1
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The primary redirect URL is https://netcdn.online/app/431946152/free-roblox-followers-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-roblox-followers-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005193.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5193 27068 bytes
SHA-256: 925dcd57f9228872e7468b09ff10ad29055b4616634ccfb84ec0f3a294103e73
font_01_sfnt_off00008f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F15 18112 bytes
SHA-256: ccd38d5c4d6902a87b59ff7236a25d6da26946ef77410ea8fc3c9751fa4e7a37

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