Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bda417ff64b4b69…

MALICIOUS

PDF

35.0 KB Created: 2021-06-22 20:49:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f4c30b3651cc6727eef4ee481e8a6d6a SHA-1: aad88f469d8ac952f702f62e5daa1af2b39314fa SHA-256: 6bda417ff64b4b699578eb60b9a054d2551fc4b49e8288d2352807ff8d037465
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game currency and hacks, directing users to external URLs. The heuristic findings indicate it's part of a link farm or SEO manipulation scheme, with numerous embedded links to other PDF files. The ML classifier strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent behind the redirection and link farm.

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/giftcards-roblox-free-game-hack PDF link annotation
    • https://beauty911.tw/upload/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-get-free-robux-no-survey-or-verification_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/best-free-roblox-exploit-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/robux-hacks-that-work-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-link_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/descargar-roblox-hack-robux-pc_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-generator-no-download_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/roblox-giant-survival-cheats_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_off000031be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BE 22436 bytes
SHA-256: 72dc7ea50457490c431a04157785c5442583f2992b7505f050da8afc9b989960
font_01_sfnt_off000063aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AA 19048 bytes
SHA-256: 5d6cec3d9ae4e041c5f76e90c79493e87d7acbf3b60a98b620d622ef4a200675

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