Malicious PDF — malware analysis report

Static analysis result for SHA-256 8918042a11069f1a…

MALICIOUS

PDF

33.7 KB Created: 2021-06-29 10:45:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d6afb0c6611719dd1f8b12be7a98b3f9 SHA-1: d4cbb245dc689165ca09248db0ad1e6a02208520 SHA-256: 8918042a11069f1a0a2be2bfd94bf1ed29b7e236a366901a6767540220ab1937
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/robux-robux-hack-game-hack PDF link annotation
    • http://lib.untad.ac.id//repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-game-passes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-cheat-codes-for-money-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/descargar-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-walk-through-walls-in-roblox-jailbreak-no-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/games-that-can-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/pubg-uc-wholesale_GM1330123889.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-gta-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-someones-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-auto-aim-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/premium-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/can-you-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-any-game-pass-for-free-roblox_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_off00002e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E26 22364 bytes
SHA-256: 1bc4ab49ea6affd452d032025e1a18c5db85f176d98c228fadfb37472a014105
font_01_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 18724 bytes
SHA-256: e8968fd2130dd0e19937d9907a0efa8c300424940f22b7ca5343d475ddd9ad09

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