Malicious PDF — malware analysis report

Static analysis result for SHA-256 41156150b41a96ee…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 10:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 25ce10bb537c52367cbe8a94758a596f SHA-1: 6e15c1959ca753c26d64e98ac79864592fe0a8ff SHA-256: 41156150b41a96eeef8adc2bfe49e4ad2382a2a79904cb89f1e06185212e25db
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a lure of 'Free Robux' and 'game hacks' to direct users to external URLs. It contains a significant number of links to other PDF files hosted on `lib.akper17.ac.id`, suggesting a link farm or SEO manipulation tactic. The primary URL `https://netcdn.online/app/431946152/free-robux-app-real-game-hack` is also a strong indicator of malicious intent, likely leading to further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/431946152/free-robux-app-real-game-hack PDF link annotation
    • http://lib.akper17.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/tiktok-free-likes-and-followers-2021_GM835599320.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/robux-free-2021_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_off000051e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E5 25840 bytes
SHA-256: 753f1e84b44a7b9a4276e78978e9d85e50aaaaa799fe29360ba3ea1183acff81
font_01_sfnt_off00008bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCB 18492 bytes
SHA-256: 9e447b6d8b47d61e54db9515b6598511f2c2f765926adb3e35dae1cd8ee44e1f

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