Malicious PDF — malware analysis report

Static analysis result for SHA-256 e947fd2f7ff96584…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 22:06:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1742f459889a080ca6fce4ecece56df1 SHA-1: c880fc95322b500d6802131be8673dc71e2c3f89 SHA-256: e947fd2f7ff96584a996f3fee779dd24859ef4dd72744e8556e7c1cdc52bbb26
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are disguised as game hacks or generators for popular mobile games. The heuristic firings indicate this is a link farm designed to redirect users to potentially malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-no-download-game-hack PDF link annotation
    • http://hindicenter.com/images/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/how-do-you-get-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_off00004986.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4986 26260 bytes
SHA-256: 11abfd924deca5ac5f6706c5ac443241a1d908147feadbb3a5a1e724bcaf6bb3
font_01_sfnt_off00008644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 18296 bytes
SHA-256: b5e07150b2161f53c53a5a0ecf5e7f42140b65a1732b8c9e08245fa4e84c8ce4

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