Malicious PDF — malware analysis report

Static analysis result for SHA-256 c252713e78e8db1c…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 01:37:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11799bb789a8c6f329df33b1d2ffae8e SHA-1: 76617a312d52fb2707e80a82eb5535eb26f19a75 SHA-256: c252713e78e8db1c3e0df6276765c531dc17efd4e77be219675cf06ce96941eb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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.
  • 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/406889139/daily-free-spin-and-coin-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/rbx-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/demon-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-coin-master-free-spins-in-email_GM406889139.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_off000049bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BD 25208 bytes
SHA-256: c992a29f8ae61b28544d8d2b020486e9b41ddbcfa370ae909ef9769aa59c5786
font_01_sfnt_off0000832c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 18380 bytes
SHA-256: 6101249768ea98132d58b7ce4bec1ba8398b7dbfa6e5834de96bb11e225e4313

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