Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f5fd88b0db8074…

MALICIOUS

PDF

42.2 KB Created: 2021-05-11 20:13:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f1f0e1ecac379a63129eb2aa8020ee0d SHA-1: 2cc3d7008753e12f66557d1d0b097610aa4c8658 SHA-256: 38f5fd88b0db8074d96aec2c0c9982e43613e7f8614f790c5b4c463bdba45636
122 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'free Roblox accounts' and 'game hacks' to entice users to click on a malicious URL. The link redirects to a site that impersonates Microsoft, likely to harvest credentials or deliver a second-stage payload. The ML classifier strongly indicated maliciousness, and the PDF structure contains external URI references consistent with this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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-accounts-for-sale-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.xyz/app/431946152/roblox-accounts-for-sale-free-game-hack PDF link annotation
    • http://biljartenbarendrecht.nl/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/roblox-system_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CD 25416 bytes
SHA-256: de6c71fe99db2af8287409659b37b8654a1ac90e228bb8f03396ccc2a1b2b48c
font_01_sfnt_off0000822c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 18420 bytes
SHA-256: dd3ad9a96696997a3401d80a50f84ab99edff121f3fdc84dc04c1b1c7a8d1cbe

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