Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d39928295a9ecf…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 18:37:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f7a482834b639f0fd2105f667b40368e SHA-1: a9bf9945a053fdff6faa9461f890aa07da90e323 SHA-256: b0d39928295a9ecf06a98e67262c104f1d15df7076573e1c4b60b14cfb7e7907
182 Risk Score

Malware Insights

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

This PDF document employs a link farm strategy, presenting numerous links to external PDFs that promise game hacks or generators, such as 'minecraft-wurst-game-hack'. The document also features a fake CAPTCHA or human verification prompt to trick users into interacting with these malicious links. The high number of external links and the deceptive nature of the content strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/479516143/minecraft-wurst-game-hack PDF link annotation
    • http://tcarh.com/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/robux-2021_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://tcarh.com/images/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tcarh.com/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://tcarh.com/images/free-pet-food-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_003_off00004a09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A09 24916 bytes
SHA-256: ebc9fbb0d94cd40e15e53dcd152096ba545c1e47fc52a85275e7da69da2466f2
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 17904 bytes
SHA-256: 6cf7ff8bcf9245938aca4eb00b48b7f4b489249ade5837454daf8c34eab52db5

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