Malicious PDF — malware analysis report

Static analysis result for SHA-256 f372e42edf3d02a9…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 14:43:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 83c3a1f3b7d799cd9199258eb7e9b52c SHA-1: a9f5120b39c975d63863d57c1a176ad3c4ab4173 SHA-256: f372e42edf3d02a97cbf224dc7050ed3f0b177fac3c285619e73d48ba4357969
222 Risk Score

Malware Insights

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

This PDF document is designed as a lure, presenting a fake CAPTCHA and download buttons to trick users into clicking links. The primary link, 'https://netcdn.tw/app/431946152/roblox-exploit-download-for-free-game-hack', and numerous others found within the document, lead to a link farm of other PDF files, likely intended to distribute malware or generate ad revenue. The document impersonates brands like Microsoft to enhance its credibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 7

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-exploit-download-for-free-game-hack.
  • 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.tw/app/431946152/roblox-exploit-download-for-free-game-hack PDF link annotation
    • http://library.stembi.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-accounts-with-robux-list_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-yard-work-simulator-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-avoid-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-generator-no-survey-d_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-rare-knife-effect-twitter_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-bee-swarm-simulator-tickets-locations-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-make-things-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hack-para-shinobi-life-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn 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
font_00_sfnt_off000050a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A9 29124 bytes
SHA-256: ed5b325f29426639de6b6024cacdbee09d98640ac8fe8a8a46349ff0082b1262
font_01_sfnt_off0000923f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x923F 3560 bytes
SHA-256: 6d4a056088be63c2808d49e2f59ee1d1dc1b266379a84cb763c03ae5a5a25388
font_02_sfnt_off00009e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1B 19084 bytes
SHA-256: 1ae573e8bc977eb7b3d00552e756e55f2c2b3e7bf5d8454ca4ff43edbb6b1fb9

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