Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c4a5eca58a97f6…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 06:54:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 737e1e971a88bab3419cc18f444ab5de SHA-1: 13a43a293905101d5ffa4b9052fdf37a1df17bd6 SHA-256: d4c4a5eca58a97f6cc4fa6455b17475bcaa135e3aeaeb2236f1c27e324cc46d1
222 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a fake-CAPTCHA lure. 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 0.9971

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.xyz/app/431946152/roblox-games-with-free-vip-servers-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.xyz/app/431946152/roblox-games-with-free-vip-servers-game-hack PDF link annotation
    • http://geometraperiotto.it/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://geometraperiotto.it/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://geometraperiotto.it/images/how-to-make-a-group-on-roblox-for-free_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_off000048e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48E6 24152 bytes
SHA-256: 03569af88f7cff8316f36ba4e615ff18c4a90f12d97178dc18daa3d368389ecb
font_01_sfnt_off00008001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 19448 bytes
SHA-256: 7f710df973ea6b199c1d8a9eebfc78f33dea52488aae7810c2817cc78585c0c8

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