Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9728055d9179b9…

MALICIOUS

PDF

45.5 KB Created: 2021-06-04 02:13:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6aa279f51c36e86f39243828d417cd27 SHA-1: df9f8b5015145374087f605d6600186e235a8fe2 SHA-256: 6a9728055d9179b960e9c4a018ec3ac7ea7993dc30c545454da36be6f3ff83fd
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure. The file 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 0.9864

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-now_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_off000052d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D3 26760 bytes
SHA-256: 08f3201558047c1581d7df2d321e45488a3e924c45e090bf6a6bf476f6cebc00
font_01_sfnt_off00008e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E77 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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