Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca5e80ad4319aae…

MALICIOUS

PDF

34.3 KB Created: 2021-07-19 11:01:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 844fc585f289d7ac857e5150e55cae17 SHA-1: 3177d40851faf04d63363cec9adc7feea34734c3 SHA-256: 4ca5e80ad4319aae0d91b7ccceacfaa5621f146ba6c2f41f345f072c9bc70538
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 0.9955

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 http://netcdn.tw/app/406889139/free-coin-coin-master-game-hack PDF link annotation
    • https://maximabm.com/uploaded_files/userfiles/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/mine-minecraft-games-for-free_GM479516143.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_002_off0000316f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316F 23312 bytes
SHA-256: b0f3c1e9602963792eca037f89b1a8c0a18f54c017e339e14dd9d6fa502c073e
font_01_sfnt_off000065d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D4 17712 bytes
SHA-256: effefb876c7a76aa063811ff0160e46fb8a90dd5507c6c48ef6fa39823ab5c8c

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