Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d70352d6d8f982…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 00:36:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5c9955a156cddb260125021ce7a03b26 SHA-1: 1e9bfdb317d623408b157958b2f53e6e8d59ceab SHA-256: 59d70352d6d8f982d836b623bcabf80bc0c5afe46e39f69c9d874342a2c4ccbc
122 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. The file 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 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/how-to-make-free-robux-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/how-to-make-free-robux-game-hack PDF link annotation
    • https://razredna-nastava.net/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-adder_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-people-in-roblox_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_off0000471c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471C 26460 bytes
SHA-256: 9cfeeb31ef404e5afd6055d31f7db2e5d409a636dd25817f24d8c5d60a84b2f8
font_01_sfnt_off000082e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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