Malicious PDF — malware analysis report

Static analysis result for SHA-256 da633e0c4aaf0b64…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 14:41:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bba4677c4b6dc18cee4c474b415eedea SHA-1: 384b88deae14b18795c5bdec4376ad7c98928702 SHA-256: da633e0c4aaf0b64682222a0ee7fc806d6d90d113cdf37d685097f53a9b3618f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a high number of external links, many of which are disguised as game-related resources like 'free robux' or 'game hacks'. The primary link, 'https://netcdn.xyz/app/431946152/roblox-hack-client-game-hack', and the numerous links hosted on 'pustaka.staiyastispadang.ac.id' suggest a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/roblox-hack-client-game-hack PDF link annotation
    • https://pustaka.staiyastispadang.ac.id/repository/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://pustaka.staiyastispadang.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.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_003_off00004d11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D11 25596 bytes
SHA-256: 81615d6f1fedb67775cfcde8fb13897d5aa39dc7702ede752f93156e9bd432ce
font_01_sfnt_off00008772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8772 18408 bytes
SHA-256: 550f62bb1f49814ef42b1b735b63b4edf215944f9d7482118736a3d91d594bfc

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