Malicious PDF — malware analysis report

Static analysis result for SHA-256 613f3d4250d53a93…

MALICIOUS

PDF

50.2 KB Created: 2021-06-08 17:55:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c4eb157924665ac50220856766ee749 SHA-1: abbe3f2f57945ce84851ffd12946c0f7957ccdde SHA-256: 613f3d4250d53a93e1c1a689d0c4b4808b19bd9224f0af401730fed884efdcf4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9789

Heuristics 4

  • 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.tw/app/431946152/stain-my-hero-academia-roblox-free-shop-t-schirts-game-hack PDF link annotation
    • http://digilib.unbari.ac.id/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DE 28776 bytes
SHA-256: 09847fc06789fea036aa4021156436f5c0b1f372a90761b7900962069ae0441a
font_01_sfnt_off000093cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CD 3016 bytes
SHA-256: 4c3e2db5174821787a4569c9da4979555510caebd15fb9cea35573c139e242bd
font_02_sfnt_off00009e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 19552 bytes
SHA-256: 38407fd965200b7e7a719b51dfc4027401ca82a7953d858cd0b5037519bbc526

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