Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d165956ec552eff…

MALICIOUS

PDF

36.6 KB Created: 2021-07-08 01:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e65fad51a79f300f3455371925f78286 SHA-1: ab2e561d1e584313823d186369967ab62f249b1a SHA-256: 9d165956ec552eff301b837d8ee9492f688bd6fc94f3ed0891b36eaf23391ef7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which are hosted on domains associated with SEO link farms. The primary lure appears to be related to game hacks and free in-game currency, directing users to sites like 'netcdn.tw' and various PDFs on 'eyeonhimalaya.com'. The ML classifier strongly indicated maliciousness, and the overall structure suggests a campaign to drive traffic to potentially harmful or ad-heavy websites.

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.tw/app/406889139/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1-game-hack PDF link annotation
    • https://eyeonhimalaya.com/userfiles/files/roblox-prison-life-hack-gui-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/claim-roblox_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-use-pastebin-for-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/client-minecraft_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
stream_002_off0000325b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325B 23644 bytes
SHA-256: ff6ef1bef65e24547bd35b44d5c0099f884da9f81f41428e7517c84b3920f661
font_01_sfnt_off000067d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 19856 bytes
SHA-256: f0d07fc9a8b3d111c46ca54fced247fedfcb4542d6f6095b7fcb29b436cac6f2

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