Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f5497f5cccbf35…

MALICIOUS

PDF

44.4 KB Created: 2021-05-16 12:15:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: efd8658a1929662ff84f2c08b5d1496b SHA-1: 8df78e0386ce2cb28a6cb003828a8bed5be1d60a SHA-256: a8f5497f5cccbf357d131685caee7f0600ba7ef177a199b6f0f27bd3b0716e02
182 Risk Score

Malware Insights

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

This PDF document employs a lure of free Robux and game hacks, impersonating the Amazon brand to trick users into clicking malicious links. The document contains a large number of external links, many of which are SEO-optimized PDF links, suggesting a link farm or redirector strategy. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack, which is used in a credential phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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/free-robux-kid-friendly-no-human-verification-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/free-robux-kid-friendly-no-human-verification-game-hack PDF link annotation
    • https://www.citrus-shop.cz/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/give-me-robux_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/robux-sites_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.citrus-shop.cz/images/free-robux-generator-no-human-verification-or-survey-2021_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
stream_003_off00004a63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A63 26364 bytes
SHA-256: b4264c788b2b856b878ec0ddcf53d2e12dbf6b5ee013751f340520f53adba953
font_01_sfnt_off00008820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8820 19288 bytes
SHA-256: ea469787df873758e357019bb53a1e3c4242eb718badaf8706c42bdc2f61c813

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