Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf64912b80c22852…

MALICIOUS

PDF

49.9 KB Created: 2021-05-16 01:37:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5fd1626133f8f534dea02a44750eb0b8 SHA-1: d2f12b3778dd989966129aaf0039d741c5f0b78e SHA-256: cf64912b80c22852538a2174179fe2566f2589d3b17e9d03edc7ab6adc1cd993
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to SEO-optimized pages related to game cheats and free currency, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious. The presence of a 'password-protected archive handoff' heuristic indicates a potential attempt to conceal a malicious payload, which is often delivered via a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-actually-get-free-robux-game-hack
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/get-robux-today_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/free-robux-no-verification-required_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-hack-1021_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-spin-link-2021_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-free-spins-twitter_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/how-to-make-a-free-minecraft-account_GM479516143.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/huskybuscom-free-robux_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/www-roblox-com-robux_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/no-verification-coin-master-hack_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/op-rewards-robux_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/download-apps-for-robux_GM431946152.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-card-collection-hack-apk_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/coin-master-hack-spins-apk-download_GM406889139.pdf
    • http://elearning.mithkromasantulungagung.com/__statics/gudangsoal/files/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ed5.bin
752b1dbfd31c0f59f61fac32eb5673316ce5ef5896c28860e1e4383e6f7cec8b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED5 30500 bytes
font_01_sfnt_off00009222.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9222 5696 bytes
font_02_sfnt_off00009f33.bin
380379838da7ba69723634981f8e24f026256aff947d3d13a6d99450b2ab0cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F33 18764 bytes

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