Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c7451f6d51efe8…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 04:04:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7f6a3731b8fcb87f51efd1df62928482 SHA-1: 61a45b8f27717128f94161c741d35bc31721b847 SHA-256: a7c7451f6d51efe89d2c75d099c84c97bdadc930c573742522aa8da2e5fea3f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body and embedded URLs suggest a lure for game-related cheats or currency, a common tactic for distributing malware. The ML classifier also flagged this PDF as malicious.

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/406889139/hack-coin-master-game-download-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/infinite-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/tiktok-free-like_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-email-rewards_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004efe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFE 26204 bytes
SHA-256: 47e0e8d26dbf52d954a6edb009a947e61ad2e68a0f2a8b9a0a489dc58dde93f4
font_01_sfnt_off00008b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0F 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00009529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9529 18556 bytes
SHA-256: aaade648ef56f1f9167d0db62f5c53722f102658163b7711b8d17774315d1610

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