Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3debf2871722d…

MALICIOUS

PDF

44.2 KB Created: 2021-06-07 19:01:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 58778abeb67ed3709488228977f3cc53 SHA-1: ad55a7f8041e2666d925641df0de18fb3e87985b SHA-256: 40b3debf2871722dd1a620f128e11d7c9ba8c0891742b3914c0dc2f38d4f9ef5
142 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as downloads for game cheats. The document contains a large number of external links, many of which point to PDF files hosted on similar domains, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/noclip-hack-for-roblox-game-hack PDF link annotation
    • http://easytransferbrazil.com/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/robux-gratis_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/robux-earner_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/tiktok-free-images_GM835599320.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/what-pubg-uc-code_GM1330123889.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
stream_004_off00004dd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD2 25668 bytes
SHA-256: 7d1a66dbc00adacd25a31d8cd5f19087b20861c8b7303c6a6bd55be7a12bef7c
font_01_sfnt_off000088f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F3 18640 bytes
SHA-256: 7cb7d0ad1103bbf353e39292e281decaf4ae8df93c624ab2c2f533d2aa0b6aa7

Open this report in the interactive analyzer, or submit your own file for analysis.