Malicious PDF — malware analysis report

Static analysis result for SHA-256 510b51ae6ac8fcda…

MALICIOUS

PDF

32.8 KB Created: 2021-06-18 17:46:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0f7fb04e1b7e0c5be707e13c9429b672 SHA-1: bb1a3e0c203b437b94e0c6cb4c19487455a0f6b5 SHA-256: 510b51ae6ac8fcdae170ce7686e9a933123ffb4f3472f5972c960ac736440735
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 0.9824

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/hack-para-juegos-de-guerra-roblox-game-hack PDF link annotation
    • http://autoskola-scp.com/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/pubg-uc-apk_GM1330123889.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://autoskola-scp.com/files/guild-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/cheat-codes-fo-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-hack-no-generator_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000029c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29C7 22284 bytes
SHA-256: b36dc1711cbb56e255bde0d46b438a6666ce8d20f0ab75065198aa858b5ae256
font_01_sfnt_off00005ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE0 19284 bytes
SHA-256: c8ba38a16bd1b759b49899285b7ceddafc88d53eb7c557f880705ff9367133f4

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