Malicious PDF — malware analysis report

Static analysis result for SHA-256 a239c10b5c7285c4…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 03:17:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aed16c7be1cab34408d72ca95ba8b70a SHA-1: 11cfb630220b61bcfc5b4918af1a38a2b643136e SHA-256: a239c10b5c7285c47f36384d91108c95b61c4395f8acfb822b6e2cc8126cb021
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-get-free-robux-website-game-hack PDF link annotation
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/how-to-use-synapes-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/roblox-obby-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-accessories-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/no-human-verification-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.e-learning.mtsn-1-pasangkayu.sch.id/__statics/gudangsoal/files/how-to-fly-hack-in-roblox-prison-life_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_off00003489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3489 22488 bytes
SHA-256: 055308643678d3b717e2f978ae17992fdf74ab6cd4f30e9d7aa055bcb636c42c
font_01_sfnt_off000066c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C5 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd