Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fe39e1439ad0f3…

MALICIOUS

PDF

35.4 KB Created: 2021-06-25 06:46:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b9df0f7b5e0182e59afdcd6bba1a256 SHA-1: aba2ad7d074c1c34b80860cb4101422284a194af SHA-256: 20fe39e1439ad0f35ba6020f8d9236a378bcfdb183dc316080e30d31d74b6543
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes free in-game currency and items for popular games, acting as a lure. The presence of a PDF URI heuristic and a high ML classifier score indicate malicious intent, likely to direct users to download malware or engage in further phishing activities. The document's structure suggests it is part of a link farm designed to attract users searching for game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/431946152/how-to-get-free-robux-with-cheat-engine-6.4-game-hack PDF link annotation
    • http://apotema.com.co/ufiles/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-roblox-for-free-on-ipad_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/simplysarc_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-robux-generator-no-human-verification-2021-ipad_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-free-gamepasses-script_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/tiktok-free-likes-and-views_GM835599320.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/minecraft-the-complete-handbook-collection_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_off00003021.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3021 22868 bytes
SHA-256: 2aa6e66c6b0f6225a4de82b371b014c8e07a1f41d62442def754b3016fb30fa0
font_01_sfnt_off00006365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 19764 bytes
SHA-256: b823318d20f59835c6f04c08418692de5b82125bc96ed196d5e922d60e4bb42f

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