Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d2da66a4dad8d4…

MALICIOUS

PDF

44.4 KB Created: 2021-06-04 00:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb23ed8d956504b836fd7a8fda4f9e05 SHA-1: 10a87cc4a8a28462591866f643f08d7506c00c75 SHA-256: 30d2da66a4dad8d4e797d1d67445a455264a908e2cab288d344fe5cf6c8c0fad
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 0.9865

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.online/app/431946152/how-do-u-get-free-robux-2021-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-hack-no-human-verification-or-survey_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_004_off0000500f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500F 24736 bytes
SHA-256: 4bfc5052960230b30b97287e95de85e196a70f05ffd08be1687cc8bf8e6bb5f9
font_01_sfnt_off000088a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 19040 bytes
SHA-256: 14ed63897d8c38c9b74f4ae6c685ddc963b8153977262fdb6411d06658c720a7

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