Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45fd61ca91a0958…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 07:35:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9cf546985468002d2fb3493ae57929f8 SHA-1: e95d39efbe526f16eab0aa85bc730c13b4d22f76 SHA-256: c45fd61ca91a0958e0b8126ee7319e0da57f384264c6bae3b96e2a49b92996ae
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.co/app/431946152/free-robux-rewards-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-robux-off-of-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/astuce-anti-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-robux-for-free-in-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-hair-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robot-animation-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/game-guardian-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.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_off00002e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7F 23124 bytes
SHA-256: 8cbb31ab8b727cd816d2e8eebf379224afeada6cade26ff7a9312138d7eafa0a
font_01_sfnt_off0000625e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 19056 bytes
SHA-256: 5fd868e4ea22638534696fb0cd66a74addf388445670d9d0517416fd5b37f315