Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbc1cb70f8f6348…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 22:37:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a955e32a8a75e86d930f8b1ff2ebc8a1 SHA-1: 586823b96b51b72f916272d63a374a724d6224ff SHA-256: cbbc1cb70f8f63485ccc49d713df35ff2cc84322b1717afe97d4bc123ae66cfd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains numerous links to websites that promise game hacks and free in-game currency, such as 'free spins' and 'robux'. The heuristic firings indicate a link farm and a lure for game hacks, strongly suggesting a phishing or scamming attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/free-spins-from-coin-master-game-hack PDF link annotation
    • 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/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/code-free-robux_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_003_off00004b06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B06 24592 bytes
SHA-256: 79ea2c0a1ce7656b95d2d201aa8f26043511ad6ae406658416c0643c7bb7e30a
font_01_sfnt_off0000835e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835E 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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