Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ce1c60099f8b84…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 07:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d7cac6a7a509721f143a84c2a43d18f SHA-1: 0b219c58f7553e505fc6d12e929624291a99d93c SHA-256: 65ce1c60099f8b84fe843e565552c087399afdf54b6e8a8c862320fe596c5e03
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which are structured as SEO link farms, pointing to sites offering game hacks and cheats. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the document, likely to initiate a download or navigate to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-coins-for-flip-master-game-hack PDF link annotation
    • http://neltalen.nl/images/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-rape_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-spins-on-coin-master-game_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B44 25468 bytes
SHA-256: bf4558523930deeba1e4fc654fef3512956861d93ef5450c41a4accde4d16ec0
font_01_sfnt_off000083b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 17960 bytes
SHA-256: 02313c49670fbf7343f00752d4f8f282f2b389028f73da699401a8e4fa62a38f

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