Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d44ce7353b8d087…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 09:52:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 62e3389eb3a574c146a9dd9e6e1ee2d4 SHA-1: 1bec6023588318f5a69b33c8ab17771fef74c62d SHA-256: 4d44ce7353b8d087adfe7d64d5a514dfdfeed2d0e00192c89fbd7d70a6dea3be
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

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.
  • 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.
  • 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 http://netcdn.co/app/431946152/how-do-you-get-free-robux-easy-way-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/free-robux-gift-card-numbers_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-fedora-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-cheat-engine-bypass-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/im-hacking-ur-account-roblox-music-code_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-do-you-upload-audio-to-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-retro-craftwars-script-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-group-funds-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-fly-hack_GM431946152.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_off00002eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAE 22604 bytes
SHA-256: 30281b8d4e96530eeae5038ec6e1d1c0e519527a68dbefc98a8103cff6d8081f
font_01_sfnt_off00006158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6158 19692 bytes
SHA-256: 373f4c9db8bd9937da4b82a286de5442b90d06f45f77625a3d2106d4e2a3d192

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