Malicious PDF — malware analysis report

Static analysis result for SHA-256 a545f61bea0b4b43…

MALICIOUS

PDF

35.1 KB Created: 2021-06-18 06:12:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad3e3236263ab9b9d820dabc7f0253eb SHA-1: 530b76a7bb983592daea47645b8712cdb292ee00 SHA-256: a545f61bea0b4b438385b490e46e856cebb65ebfde93740d92050dcf34becbbe
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous embedded URLs and a prominent call-to-action related to obtaining free in-game currency for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to a site that likely hosts a malicious payload or phishing page. The heuristic for a password-protected archive lure indicates a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-robux-no-password-no-human-verification-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk/repository/roblox-giveaways-top-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/get-50-00-robux-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-robux-for-free-on-mac_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/code-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coun-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-free-install_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
font_00_sfnt_off00002ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA6 22716 bytes
SHA-256: 24e3764cf5512c8a59192fb8bbc96ff6e2474a7cc88c7b3cc368cf7adba2e081
font_01_sfnt_off000061b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 19824 bytes
SHA-256: 74220c0e8ce7b3ec1fc6d16214de536ec8eb8a8c26ada4f1803f63a23a405c01

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