Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26be8b71cfe92be…

MALICIOUS

PDF

48.2 KB Created: 2021-05-17 10:06:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 30ca060f79a434643a9663a18476800a SHA-1: 78cf13f1d3719761b5ad0a4532d717d600645c29 SHA-256: a26be8b71cfe92be9a6fc7b91e11e5b733a116423ed768b671eef288e7508855
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' lures. The primary redirector URL is https://netcdn.xyz/app/406889139/download-coin-master-free-spins-link-2021-today-game-hack, which is designed to lead users to potentially harmful content or further malicious sites. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/download-coin-master-free-spins-link-2021-today-game-hack In PDF document text
    • http://tc-kulmbach.de/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spins-on-coin-master_GM406889139.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_003_off00004a02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A02 25052 bytes
SHA-256: 4fb667544e02abc5e8898b70078a2c8abc30d76aac01c22a3ee133244f7f6d18
font_01_sfnt_off00008266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8266 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off000096f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F0 19220 bytes
SHA-256: 525b4923e2ec08582fc0eec02dda3c6a08e890396aaafa489cf9c2f67061961a

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