Malicious PDF — malware analysis report

Static analysis result for SHA-256 d775bb1bdc74d0fd…

MALICIOUS

PDF

46.3 KB Created: 2021-06-14 01:57:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31dfdf7dca0f53e336e8aea5eae67395 SHA-1: d688a808e3d1afa163454d1f257a6d90347ee244 SHA-256: d775bb1bdc74d0fd7f2eb1dfda7493a5e31f4da375ddcb011573cc1ffc49c9ea
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 0.8696

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 http://netcdn.co/app/431946152/hacking-roblox-passwords-website-game-hack PDF link annotation
    • http://www.perpustakaan.unda.ac.id//repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-usernames_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-claimer_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_003_off00004b3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3B 24944 bytes
SHA-256: b9e22ec96b57b148092bc05a7790c300b1688b8e6508e0360967e869b3b3ce1e
font_01_sfnt_off000084b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B3 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E53 19572 bytes
SHA-256: fbb79f7c99d0e3118b4d61927514d50cd2497a931fa19663d5d7eccab9562339

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