Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5aeb013a3d01db…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 18:59:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fe529bd3956e139b3c7ce81b29672bca SHA-1: 78980d754911ee9dee68c0758009018c62bb7a58 SHA-256: 7b5aeb013a3d01db2a1b7cd1d905d517362bd07a1a8fb74691b19aa0e0d26db1
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.tw/app/431946152/roblox-good-hacker-names-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/how-to-get-free-clothes-on-roblox-2021-no-bc_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/easy-hack-online-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-what-day-is-restaurant-tycoon-2-coming-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-admin-roblox-how-to-get_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/script-free-robux-2021-no-fake_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hightspeed-roblox-with-cheat-engine-windows10universal_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-gamer_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-generator-with-color-combination_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
font_00_sfnt_off00002f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F30 22108 bytes
SHA-256: 3d3d1e10b7cb0a3507c20ae8227f3e811a8dbe7e53c10cc7a7051d423a5c53fd
font_01_sfnt_off00006075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 19092 bytes
SHA-256: 99aacd4e952fa0d4ba2db078932175507ed2cbcdc9123e0578f687f9b4466a1d

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