Malicious PDF — malware analysis report

Static analysis result for SHA-256 20833fe04de01cf7…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 08:07:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8adf8ef4353a83077691d9e3f825533d SHA-1: 0f3bdeb0d7c07c957fdd39da54f41240cc6dde12 SHA-256: 20833fe04de01cf7d57951251baa7a8d3c9d9549ff10d10e371bc380438cfe52
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game-related hacks or free currency generators. One primary URL, https://netcdn.online/app/406889139/daily-free-spins-coin-master-2021-game-hack, is identified as a malicious redirector. The document also hosts a large number of SEO-optimized PDF links, suggesting a link farm intended to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/daily-free-spins-coin-master-2021-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_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_004_off0000512c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512C 25324 bytes
SHA-256: 6da24c7f8b315021f6bf9c94a6e2a8ab326f15ea7057397a3a4cc086350806ba
font_01_sfnt_off000089b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B6 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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