Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef7bcac3020b7a5…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 04:11:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 17053d1c734edf98f5dad0ac2c230c74 SHA-1: 1068716e783093f5c32f51fde3653890dd30bd59 SHA-256: 3ef7bcac3020b7a59fc9e8b2a79f7f9e27c8efffb04883c722676e2aba50db07
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is part of a link farm, specifically targeting users interested in game hacks and free currency. It directs users to a primary URL which then leads to a collection of other PDF documents, likely designed to generate traffic or host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful sites.

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/406889139/free-spin-coin-master-link-2021-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spin-links-december-30-2021_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
stream_004_off00004faa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FAA 24660 bytes
SHA-256: 0d67e2a3da3ceb74b93d2d42eee16839430e6f3f4c3eef35b6a0972c1a76a9dd
font_01_sfnt_off000086d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D5 18456 bytes
SHA-256: e9900cc34792e9e10189734f2c0a95be85fa7d2c8d6cb23872c5da80ce816735

Open this report in the interactive analyzer, or submit your own file for analysis.