Malicious PDF — malware analysis report

Static analysis result for SHA-256 5558ffaa605811b3…

MALICIOUS

PDF

41.0 KB Created: 2021-05-11 01:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d52a70ed0bbe887c194b93e1c5f3f00c SHA-1: 14367bd53226f3d85de55915fb4cff111a596247 SHA-256: 5558ffaa605811b381159a8b4a424e7d2b8680230635833752e1900d30c09e97
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/431946152/free-robux-hacker-us-game-hack PDF link annotation
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/minecraft-marketplace-free_GM479516143.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
font_00_sfnt_off00004608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4608 24028 bytes
SHA-256: fa44a4fff9cb59ca2daf662bc409fb370b05927224e0f0ae70a3de784abeb8cc
font_01_sfnt_off00007d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D04 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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