Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee78f8c30f5d5fd…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 20:52:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 13e3da2eccbec425b4700955e39c995e SHA-1: 1419f7176969967855d3d4d52c3c07dcec2e2b99 SHA-256: 9ee78f8c30f5d5fd9c7a86df3ef955fdc761135cc93e2952557d17df2c19152d
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.tw/app/431946152/kuso-icu-roblox-hack-game-hack PDF link annotation
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://lib.smpn1bambanglipuro.sch.id/repository/how-to-get-free-roblox-money_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_off00002d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D76 22560 bytes
SHA-256: 0fd66e0f5253b0c6287e5fe7b8c0a9ed91ef75de08ec2008cb9bb847a0530e96
font_01_sfnt_off00005fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCE 18796 bytes
SHA-256: ed83452c86803b1917e9a3b610437d6af8da1f9c573d2e0b135e2eca29acc62c

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