Malicious PDF — malware analysis report

Static analysis result for SHA-256 5926d9d7bb1b49dc…

MALICIOUS

PDF

51.7 KB Created: 2021-06-08 10:44:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 98e7205ca1e713bfd12b4a6067373155 SHA-1: dadce690da904b2f262e7328f174f7f43dcd6f7f SHA-256: 5926d9d7bb1b49dc00510e9104979377ff0c955f498f89258186c7361b0ed6ae
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9657

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.
  • 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.tw/app/431946152/earn-free-robux-on-roblox-game-hack PDF link annotation
    • https://cleansui-home.com.tw/image/data/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/robux-adder_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E4 27744 bytes
SHA-256: a7bbe243b3f5c7df906d5b500c4e8c90b1053603d8ecc597d9c0dad63a42149e
font_01_sfnt_off00008ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF8 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00009a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA72F 18316 bytes
SHA-256: 9c0981cacc72906997edc94ef8681ff328413c242d975763da1b98cbde4aeec5

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