Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fa401e5793e8ca…

MALICIOUS

PDF

33.1 KB Created: 2021-06-19 20:01:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b18cebdfc62ecd1d9e8cebc5b6904910 SHA-1: 6d5edad08e027a5c31d228b290f7287a5ee09d3d SHA-256: a6fa401e5793e8cab191f1bfa3276955794251d8efe6d737a2051c6f6b36c93b
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and cheats. The primary lure appears to be related to 'Roblox' and 'Coin Master' hacks, directing users to potentially malicious download sites or phishing pages. The ML classifier strongly indicated maliciousness, and the overall structure suggests a campaign to drive traffic to sites hosting malware or scams.

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/pant-free-roblox-game-hack PDF link annotation
    • http://repository.ummy.ac.id/repository/roblox-scripts-for-games-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-any-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-1-robux-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-present-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-jailbreak-unlimited-free-money-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-accounts-from-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-on-ipad_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_off00002c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3F 21912 bytes
SHA-256: 24b9b744ecbd449bb98de3d006b8d5ad5274ab374976d73370f8f8663fcc9d7e
font_01_sfnt_off00005c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8F 18908 bytes
SHA-256: 828c8f9d446ad428f1fcfe59b48f48fa33b0d8f76e77d8c8d50c2f0b4926aae9

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