Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b724ee71c499d5…

MALICIOUS

PDF

35.9 KB Created: 2021-06-19 17:11:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33f32ca5c00e940c994bf1ce49e99d7f SHA-1: ea69f339cb24d8a249bfb862bdb50e356d9511b5 SHA-256: 13b724ee71c499d5893cccf3eb95432f6980617a63ff168220e95b3e7366077e
102 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to files related to game cheats and hacks. This suggests a link farm designed to attract users seeking such content, likely leading to malicious downloads or further compromise. The ML classifier also strongly indicated maliciousness.

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/free-roblox-catalogs-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-any-roblox-gamepass-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-rb-world-2_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/yt-roblox-hacks-admin-commands_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-roblox-dragon-ball-rage-android_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-ios-12_GM406889139.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
font_00_sfnt_off00003518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3518 22888 bytes
SHA-256: 33e96ab8d23753d8574f094f4a92f407ba9914a6030564b9f1980dc2622ba937
font_01_sfnt_off0000685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 18752 bytes
SHA-256: b0ae5e0bb59ef88ec9c489f8cb6096a6a3ab894a8148bbda4a0800eae64dc6e7

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