Malicious PDF — malware analysis report

Static analysis result for SHA-256 59083ef190a18ddb…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 23:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4b6a8ba7f5717e89d4944c6e41de212b SHA-1: 0987d766de70a24e0a1c4496819307e946b54893 SHA-256: 59083ef190a18ddb036d832597ea3409f952547b399301891ce56abd908f2aa9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external URLs, some of which are algorithmically generated, suggesting an attempt to distribute malicious content. The document body and embedded links promote free in-game currency and hacks for popular games, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://netcdn.tw/app/406889139/free-coins-and-spins-coin-master-game-hack
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-hack-2021-free_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-coins-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/minecraft-fly-hack_GM479516143.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-free-clothes-no-bc_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-free-robux-slows-down-towards-100_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/spin-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-arc-of-elements-hack_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-espaol_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-rich-roblox-accounts_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/but-to-legit-get-free-builders-club-on-roblox_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-2021-no-verification_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/give-me-free-robux-google_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/tiktok-free-view-iphone-apps_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003573.bin
4923a84ce395b92f874e3f7f8455b8b5837a9a57c3ad820e64964a5c42161a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3573 22972 bytes
font_01_sfnt_off00006923.bin
c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6923 18348 bytes

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