Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30e89fb9676c1f8…

MALICIOUS

PDF

44.3 KB Created: 2021-06-13 23:50:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 10112ed837b7566096ff24b43063cd97 SHA-1: 399e2a8eee214ee797c572a763bdbd51b6962c40 SHA-256: d30e89fb9676c1f887a694ac858edb0aeeae37057b6a90ef442e115f6b45923c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple lures for game hacks and free currency, directing users to a network of SEO-optimized PDF files hosted on a university repository. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

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-kick-simulator-roblox-game-hack PDF link annotation
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-free-stuff-in-roblox-2021-september_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://discordIn 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_003_off000048e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E2 27920 bytes
SHA-256: 5d4bbbcd28690abbcc595a17986a129f2b3170c8c166f64ce8b8283eb567d269
font_01_sfnt_off0000891d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891D 18968 bytes
SHA-256: fc2f5bf139b6c5b632c00fb8a7b6df08d5fd68de90993905dadfaf047b4924a8

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