Malicious PDF — malware analysis report

Static analysis result for SHA-256 f584d9dfe9f430c8…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 17:35:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 73982d9dd335c33fd2b46b9532b884f8 SHA-1: dfb37158206e789cd1deb6abbdab50174153a43a SHA-256: f584d9dfe9f430c8c9875c35921d0b85f86148a85db52c2d4e91669fd30f5e20
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 0.9551

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/coin-master-free-spin-codes-game-hack PDF link annotation
    • https://yc-certify.com.tw/image/data/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B47 24816 bytes
SHA-256: e811cbb48844d125bf7ca7c7f726f89e6363166cd6f9c8664b271cecc4d582fe
font_01_sfnt_off000083dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DC 3204 bytes
SHA-256: 34e186eaedd0abe30d9918006f165105e5268ee5cd317aca3337fe6c60666134
font_02_sfnt_off00008ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE0 18060 bytes
SHA-256: 6c6954b9f81c735a5c4580de4c42457a99792272849cec4d30b191d18cdb5601

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