Malicious PDF — malware analysis report

Static analysis result for SHA-256 516bf7617c5689cb…

MALICIOUS

PDF

34.6 KB Created: 2021-06-26 07:48:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf09dda6824cbc6e7b284d9bebd5f27f SHA-1: 15a3fe94f6ca0a20f479d80ede75875ac427782b SHA-256: 516bf7617c5689cb957db07d884667e8b637d2d2b76c917f5ea4eeb7f1864270
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, 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 0.9980

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 http://netcdn.co/app/431946152/can-i-use-free-models-on-my-roblox-game-game-hack PDF link annotation
    • https://opac.itp.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/synapse-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/bloxton-interview-center-anti-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/5-000-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-created-by-jess-the-gamer-girl_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-in-roblox-assassin-on-ipad_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-use-cheat-engine-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/fly-hack-roblox-jail-break_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-spins-for-coin-master-2021_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
font_00_sfnt_off00002e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E68 22664 bytes
SHA-256: 889610e0b70cb6be533c8c7c38061cca11225c065963aed6b480d263bd87d15b
font_01_sfnt_off000060f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 19460 bytes
SHA-256: 32a7f6dc6b4e1530d602a213448a767e70e9329c3089db88de7909c30e539759

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