Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b65479fc7b0528…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 14:50:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c5cac68ecf8655790032a721ca5b14f6 SHA-1: 888bc9e28da0241a0c2bbb70ed6e706253de1ae3 SHA-256: 08b65479fc7b0528049ef9c94a435f49125eb3bae1082b32d772260faa460ba5
142 Risk Score

Malware Insights

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

This PDF document contains numerous links that redirect to websites offering game hacks and free spins, a common lure for malware distribution. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many external links strongly suggest a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence.

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/479516143/wurst-18-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-download-free-chrome_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hack-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-builderman-in-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.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_off00002f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F24 22264 bytes
SHA-256: f660a8da6bb30a9a14595f397a8d635d189b42a8e559388b87020031b8c1aae2
font_01_sfnt_off00005f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F86 18388 bytes
SHA-256: f7343f89130bbe7749ba861c18716880cd21441eb855f17b99e2147c09a8a62a

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