Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13cb9c055a37c7c…

MALICIOUS

PDF

55.6 KB Created: 2021-06-08 15:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d64a70fbbea5b84005a70a5a87f59f13 SHA-1: 084b2e5ff0ad6313f424fafcfc8452f3e63a73c2 SHA-256: b13cb9c055a37c7c9cc939e9f85ba82bbf2f38bdba64c296094fdf98ba6ee15c
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 0.9358

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/omfg-check-cashes-v3-speed-hack-working-roblox-game-hack PDF link annotation
    • http://digilib-pps.unja.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/near-tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005311.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5311 27812 bytes
SHA-256: 4474de9aea769d1af87a8257d8e33c7df870d971b927e030c436a522d0cfccb2
font_01_sfnt_off000094ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off0000a013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA013 7436 bytes
SHA-256: 67b1c45dc5bf3149e9f16649dd6a7062be812d9aa5195941c4c6caddedbdb68a
font_03_sfnt_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 19872 bytes
SHA-256: 4be052a02d96e570aefcde4500f6f78b6d2ed7116e50944e406e432a4fdfcb00

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