Malicious PDF — malware analysis report

Static analysis result for SHA-256 b861e68c1b265639…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 00:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 548cd18ca48b4c6cfd586bbfdc73dcc8 SHA-1: 10882578bd59c658eb1be071108d776a1e4b5e2f SHA-256: b861e68c1b265639ebf3e4b1a3d0dc346a731174f12dfdbe77af4184949a6bbc
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 0.9971

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/coin-master-hack-tool-v1-9-pc-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-pics_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/spin-link-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
stream_003_off0000472b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x472B 26208 bytes
SHA-256: dcdb643623b5658f8884e0a03e9592da77262effac56665bbe3ba3282dc13468
font_01_sfnt_off0000833b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x833B 18348 bytes
SHA-256: 043ae0b56aad5775724b1167a22d37e7f80b7d9c769434f087fac9bc97f423c4

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