Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a8b7d771479e9c…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 23:41:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 056cbd791e38c198398a7783eb1a38d4 SHA-1: e841e1a28b2f90755abfdec7a41ebbfb9130e7b2 SHA-256: a5a8b7d771479e9cd52a33a4c0acab611fd21f7f94df3d5d6f97cdda0cbadfb1
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 urgency-based 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 0.9769

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/nintendo-switch-roblox-free-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pokemon-go-free-619_GM1094591345.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/infinite-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-easy-free-robux_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_off00005162.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5162 24756 bytes
SHA-256: 6212ad8044bdf9557f186ee5bacd79425054287302a2c501727a15bc9270d5bd
font_01_sfnt_off00008a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A32 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000096da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DA 18676 bytes
SHA-256: 4a934f853d5ac2f04bba06a849b11ff2f2ecb276419b779176da4cd1dd80357a

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