Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8554f776468f4…

MALICIOUS

PDF

47.5 KB Created: 2021-05-16 14:26:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99cd7992e80882488a49cc0424e51519 SHA-1: 55ace079cf36f6fcc80d30d87ef3817f5df358b9 SHA-256: adc8554f776468f4a98979d200410a6f93cbe277547cecd9f17e3ca4d7900c44
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains lures for free in-game items and currency, directing users to external URLs that host further PDF documents. The ML classifier and heuristic firings strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the document structure and embedded links suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-easy-on-phone-game-hack PDF link annotation
    • http://optsuvenir.by/images/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/free-coins_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48C5 28392 bytes
SHA-256: 0277e47f2b9b856b4395351a2df5d00901325135461235bbc8aec8e3bf629e09
font_01_sfnt_off00008830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9542 19008 bytes
SHA-256: e6e3347b6ae704c87521381cf50d1046861d1e5efe3155f159bfcc6a29e599dd

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