Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcf7e7020bf5435…

MALICIOUS

PDF

43.5 KB Created: 2021-05-10 18:02:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1330d4aef6077d16b845c1f33f950025 SHA-1: 605f615385c977b7c83f7faf5ba5daeb711ead3e SHA-256: bfcf7e7020bf5435ad3b1976c003d2c612af442043592eea129bccd7def8106f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as generators or hacks for popular games, aiming to trick users into visiting malicious websites. The primary lure is 'Earn Free Robux For Roblox', directing to a URL on netcdn.xyz. The document also exhibits characteristics of a link farm, with 28 external PDF links pointing to various game-related hack pages, suggesting a broad campaign to drive traffic to potentially malicious or ad-filled sites.

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/earn-free-robux-for-roblox-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-coins-for-coin-master_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_off0000471f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471F 27616 bytes
SHA-256: a9623c900db77c28988673b3f4ca6df25c745701cf93c84a880969ff6f8f5e38
font_01_sfnt_off00008787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8787 18316 bytes
SHA-256: 81577c12f28394e63c3fe269139937f952c5f2f271c4ac7315843a65914bc4b9

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