Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5f20e4393170bf…

MALICIOUS

PDF

42.3 KB Created: 2021-06-04 02:23:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3cb7bba30db3f08d1a0a04659e89d05 SHA-1: 3982fb9dca90ea396d5c95a7973752477785d1f2 SHA-256: 5e5f20e4393170bfd95bb7e1036cc18ea30a7fa6ed8f531490d0d43fbe8f691b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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/get-free-robux-info-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/robux-in_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-domain-for-minecraft-server_GM479516143.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_off00005133.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5133 25876 bytes
SHA-256: 27b14a3d3f106d2a86aa7dc7b529caa3ede3fcaa46d00c86bd9988230eba18c7
font_01_sfnt_off00008b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 18120 bytes
SHA-256: 6e6e8bb7c0e640fc67837f70826b1bbd381eb05acf75ec047415621944091573

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