Malicious PDF — malware analysis report

Static analysis result for SHA-256 d776b9c32fcf912c…

MALICIOUS

PDF

36.2 KB Created: 2021-06-26 12:40:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a06c85babbe22faa3de8faf38d2f32e3 SHA-1: 0577630a6e387ec79f679968f181e73f153c40a0 SHA-256: d776b9c32fcf912c3017a491339af28f80ed92aa147c679b5c3638b979e79140
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are designed to appear as generators or hacks for popular games like Robux and Coin Master. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates a social engineering tactic to entice users to click these links. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document, likely serving as a lure for phishing or malware distribution.

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/robux-hacks-no-human-verification-or-survey-game-hack PDF link annotation
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/robux-hack-script-in-inspect-code_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-robux-scipt_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/aves-magic-academy-hack-roblox_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-roblox-printable_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_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
font_00_sfnt_off00003497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3497 22512 bytes
SHA-256: 9c82e3e7014c74a8a7802a3431d9f85b0ba35efbb1a93dd752f1e67adb20cfb5
font_01_sfnt_off000066eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 19636 bytes
SHA-256: 9bb05bddec7674d0fe1b19dd446f08b7d8dc34b65051eac16cc262e41e58d4f9