Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8320847852d6c4…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 07:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6adfb898dcd6c629b7fe71a56bbfa095 SHA-1: cb77014677ea6c12962069ed89cf56e9aa86c65a SHA-256: 7a8320847852d6c409477328bca6c3fda0e83c2057550757597da005ab355678
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA and numerous links to game cheats and hacks, indicating a lure to trick users into downloading malicious content or visiting phishing sites. The PDF contains a large number of external links, many of which point to PDF files hosted on suspicious domains, suggesting a link farm designed to distribute malware or facilitate scams. The ML classifier also strongly flagged this PDF as malicious.

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/coin-master-spins-gratis-game-hack
    • http://stansabbiatura.com/images/free-robux-no-scam_GM431946152.pdf
    • http://stansabbiatura.com/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://stansabbiatura.com/images/free-robux-no-human-verify_GM431946152.pdf
    • http://stansabbiatura.com/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdf
    • http://stansabbiatura.com/images/roblox-script-hacks_GM431946152.pdf
    • http://stansabbiatura.com/images/coin-master-free-spin-software_GM406889139.pdf
    • http://stansabbiatura.com/images/how-to-hack-coin-master-android_GM406889139.pdf
    • http://stansabbiatura.com/images/coin-master-free-spins-and-coins-app_GM406889139.pdf
    • http://stansabbiatura.com/images/unlimited-robux-2021_GM431946152.pdf
    • http://stansabbiatura.com/images/free-robux-script_GM431946152.pdf
    • http://stansabbiatura.com/images/coin-master-free-coins-link-2021-deutsch_GM406889139.pdf
    • http://stansabbiatura.com/images/earn-free-spins-for-coin-master_GM406889139.pdf
    • http://stansabbiatura.com/images/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://stansabbiatura.com/images/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • http://stansabbiatura.com/images/coin-master-hack-version-33-2_GM406889139.pdf
    • http://stansabbiatura.com/images/unlimited-spin-coin-master-hack_GM406889139.pdf
    • http://stansabbiatura.com/images/coin-master-free-spins-blogspot_GM406889139.pdf
    • http://stansabbiatura.com/images/coin-master-date-and-time-hack_GM406889139.pdf
    • http://stansabbiatura.com/images/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • http://stansabbiatura.com/images/wurst-client-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048f3.bin
8514515a38dd44db6376b69a2602056fe861de49daa920795ee5a4889a1ab88f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F3 24736 bytes
font_01_sfnt_off000081c9.bin
14ee5d8b12066898ac0dd126fd621bcbe737ddb1f68eadc349fa8e2a98ba3f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C9 17724 bytes

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