Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d12573dbce11eb6…

MALICIOUS

PDF

43.9 KB Created: 2021-05-13 08:10:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c484b5604cbfdd0da300e2a12118b92 SHA-1: c10c20047a8a79be766de2b2844adf574f9c9f54 SHA-256: 5d12573dbce11eb60047d85a61336f6c636369080cb311958fba194de72271d0
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 0.9969

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/431946152/play-roblox-for-free-on-google-game-hack PDF link annotation
    • http://autoskola-scp.com/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/woman-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-hacked-version_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_off00004c71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C71 26000 bytes
SHA-256: 79d1611f1b8866752d68562578f94e1851c702c73bf5ca36a084b990f4185a3e
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 18796 bytes
SHA-256: 63700f01b577dfc47d2d7c093b2e3a9c26c7058fe46ada2950921e4142c9fe98

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