Malicious PDF — malware analysis report

Static analysis result for SHA-256 9069bb127b8ccf43…

MALICIOUS

PDF

33.3 KB Created: 2021-07-02 04:30:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58c5ebfb2fe967f09f0300646a4a00bb SHA-1: aa0539ccefbc8ead64a269318ad0395afe7831cf SHA-256: 9069bb127b8ccf4341d6abcd730c1be82797a60e0efa83ee1ec14fbd253f4115
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 0.9980

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 http://netcdn.co/app/431946152/robux-hack-game-hack PDF link annotation
    • http://lib.teknik.unimal.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-cheat-engine-cheat-table-executor_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-100-type-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/grayphiny-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/magitan-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-any-roblox-item-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/working-roblox-hacking-dll_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-name-for-free-gun_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-hack-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/hack-real-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-free-version_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_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 21180 bytes
SHA-256: 2527d13d1812be1535120ded795d57a380b063bf659b9602a1f2acba03596899
font_01_sfnt_off00005dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 18724 bytes
SHA-256: e8968fd2130dd0e19937d9907a0efa8c300424940f22b7ca5343d475ddd9ad09

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