Malicious PDF — malware analysis report

Static analysis result for SHA-256 145fdd4f00345935…

MALICIOUS

PDF

46.7 KB Created: 2021-06-04 00:54:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9affe953e8a7d4a8eae2fe170cc8699d SHA-1: 4366437964a408485d0a83a16a86c2d20ae1feb4 SHA-256: 145fdd4f00345935dc3056201e118777f5b054d2f7aa128d9fb8071f202ebed9
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and heuristics indicate a lure for game hacks and free generators, with one heuristic specifically identifying a fake CAPTCHA prompt. The primary URL, 'https://netcdn.online/app/479516143/how-to-get-minecraft-for-free-on-iphone-2021-game-hack', is likely the initial landing page for this scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/479516143/how-to-get-minecraft-for-free-on-iphone-2021-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/cpying-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://youtuIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005091.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5091 24964 bytes
SHA-256: fb7a219880d4c493390c6b44ecaf374c9318518f3cfec0c49f6640810e1ea939
font_01_sfnt_off000088ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EA 2824 bytes
SHA-256: 32afe7424993ed77feed76f83a3afdb3d3391dbb877b7f4b0d7509f28dd06233
font_02_sfnt_off00009291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9291 18620 bytes
SHA-256: 9dfe6830e4eff682daeb487d834da197714a5bc305fe7f1b132f92f4a863de8b

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