Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ab27c12dfe7f60…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 16:54:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0bddf3dff49a3483b3e773e1255ce1b5 SHA-1: cab212b6e57e959ba2b7a3b3697461684fbc7b2d SHA-256: b9ab27c12dfe7f6057f4598738b62b83b7c7ca7072233d469328334606de6b1b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites that are advertised as 'game hacks' or 'free currency generators'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the nature of the lures point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/hack-coin-master-using-pc-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021-glitch_GM406889139.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_003_off00004974.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4974 25188 bytes
SHA-256: 823dfdf3550908b0ce9487c9e67ab50f263ee7e90e0ea8f7ea35b6b67dbe6cb1
font_01_sfnt_off000082fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FE 18344 bytes
SHA-256: f468976bec2b3a7af1fa08eb64faad271c21d08dd6b547722e42b35607b20a03

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