Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7666024284eb84b…

MALICIOUS

PDF

33.6 KB Created: 2021-06-18 12:47:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cccaa0610cd7381434071d3a0980cb94 SHA-1: 250259e8913632b7245b768e5b54be0b02eb8f39 SHA-256: c7666024284eb84b4fd3768760f06eb3c5fed799cef7be912c1941dd5a5a715e
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/test-to-get-free-robux-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/are-there-any-actual-robux-cheats-reddit_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/tiktok-free-on-google_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-cheat-tycoon-roblox_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_off00002cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBC 22668 bytes
SHA-256: f4c3ef330baf85fc96612f65ae226885543404a50b54cb11a044dfeb66eb5096
font_01_sfnt_off00005f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 18636 bytes
SHA-256: 3339874be6db132dd37d57d9baec7ac99ef72b20c1615e04efb70742a7e74639

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