Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d01455cc79706…

MALICIOUS

PDF

34.9 KB Created: 2021-07-07 18:43:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ea4bcb794d271e73ec3d5b49412938fb SHA-1: 980a3a418de1dbedd30c7687b530d4b351b59d31 SHA-256: 2a6d01455cc79706b4d59b2a6305ea2b677db5df5e154ec37758f85b376dd96a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as game hacks and free currency generators for popular games like Coin Master and Roblox. The heuristic firings indicate this is a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in game cheats to lead them to phishing or malware download pages.

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/coin-master-free-spins-link-may-2021-game-hack PDF link annotation
    • https://cleansui.com.tw/image/data/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-account-with-dominus_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/prokjs-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/promo-codes-for-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/buildtools-roblox-hack-2021_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
stream_002_off0000314e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x314E 22496 bytes
SHA-256: 72b43d634b087630b610f5caea631e84dd4d68d003caae798f5a9c23d0f8db6b
font_01_sfnt_off00006389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 18924 bytes
SHA-256: ef212b5cda993b4ecad8fae2f854e205e09bfeaf0789e767c9f8e92b7f4704a7

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