Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63b715d1352fa50…

MALICIOUS

PDF

43.5 KB Created: 2021-05-18 02:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25b35e39df9f4853ba49a0c241ecabd6 SHA-1: 089dd585d8139566aedbc44fe59fbb74c558c6e2 SHA-256: a63b715d1352fa500364153e4e162de3ea0919eef17ead0d1e06d8953725beac
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9969

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-free-coin-hack-game-hack PDF link annotation
    • http://columbuscigar.com/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-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_003_off00004b6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6A 26924 bytes
SHA-256: 9bcafa5e1c3e058ee80b571c263a1fb71300ec1ade41260d36b1a8e4c2d016e7
font_01_sfnt_off00008922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8922 17880 bytes
SHA-256: 9d1f455011f0aa7862855f259ab9ea2efa3be9ec050c3ec97e4c793879e57b5c

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