Malicious PDF — malware analysis report

Static analysis result for SHA-256 188c538428240ad5…

MALICIOUS

PDF

46.8 KB Created: 2021-05-14 12:03:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d56181af5b14c8cef12502221bc5bcc6 SHA-1: 688ba3ca8f2b97bebf1a5f7b6e421a8c8225fa1f SHA-256: 188c538428240ad5de9d7ba2dfec56934b6284604142f8e0a081456158da7042
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are structured as SEO-optimized slugs pointing to game-related content, suggesting a link farm or content redirection scheme. The presence of a visual download button lure further supports the intent to trick users into clicking malicious links. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8729

Heuristics 4

  • 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.
  • 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/479516143/free-minecraft-games-for-kids-game-hack PDF link annotation
    • http://hardbit.cn/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coinmaster_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B99 23704 bytes
SHA-256: 8c5c0bdeaa07b4f37d8e8b8974ee88e4a3d9c8425805a7b935ee63a1b963c885
font_01_sfnt_off0000800f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 3020 bytes
SHA-256: f1a29adcea636583330be8db4f6466410de551ac48576b9e1aa5c34e2d665a1f
font_02_sfnt_off00008a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A63 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off00009473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9473 18144 bytes
SHA-256: 13e7e5cd67c7f2718453187682e852ca38f83a1f5fffd311a8da849f95858a3e

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