Malicious PDF — malware analysis report

Static analysis result for SHA-256 342438891be1557c…

MALICIOUS

PDF

34.0 KB Created: 2021-06-21 18:14:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b74122346eea06918b952853ebe855ca SHA-1: 1f09d2992cd7e6cdd4fa8b33c07c2e17ca872d1e SHA-256: 342438891be1557c92c7f92ac045fd5296859bfbf70f9fb544561fa34f1a8223
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.co/app/431946152/veil-hack-roblox-game-hack PDF link annotation
    • http://hardbit.cn/images/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/free-hats-roblox-girls_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/hack-into-a-roblox-studio-game_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/exploit-hack-roblox-free-download-mod-menu_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-bugatti-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-make-free-badges-on-roblox_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-rbxbost_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-robux-obby-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
font_00_sfnt_off00002e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E10 22612 bytes
SHA-256: 65996b52aa597960f7c13413164fc7ef18e8079ab8487e7a234c6d4580f92369
font_01_sfnt_off0000603a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 18912 bytes
SHA-256: 377014d03fb96920661a60c1905fc93145ffaf61d24e50d3762435cca7226db2

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