Malicious PDF — malware analysis report

Static analysis result for SHA-256 a653df76f5d24472…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 00:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5e14a8d8102f06dea91e876d8038a6c5 SHA-1: 2b85316ab554251a62244424d52e9e669b1f0a6f SHA-256: a653df76f5d244727c4c90458a8cf69e28cabf4da96122074e9e4d5bf2235e72
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.tw/app/406889139/coin-master-hack-app-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-free-obc-accounts-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/dayz-roblox-cheats-codes_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-free-robux-player_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-promo-codes-july-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coins-and-spins-for-coin-master_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_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 22292 bytes
SHA-256: f9cf03f72d64efa546d539113ea43600c66ae3d63679e24ed6dd0144d3a4ae3e
font_01_sfnt_off000060c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C1 18180 bytes
SHA-256: 5b637a8a036eab97bffff91a515cae84fc40b6bddd589e778cc2e69a12b03167

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