Malicious PDF — malware analysis report

Static analysis result for SHA-256 10aa902eefcb1b31…

MALICIOUS

PDF

45.9 KB Created: 2021-05-17 18:37:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b502f4ac7bd107982610bde6c378db7 SHA-1: 96f62eee8bd7ecce96c607ca547f0eb59b21b380 SHA-256: 10aa902eefcb1b31aad28e49b8f6d311bc87c5c989571ab6a78c09f2acbc6d5f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links and a fake CAPTCHA lure, designed to trick users into clicking through to external sites offering game-related cheats or currency. The ML classifier and the presence of a fake CAPTCHA heuristic strongly indicate malicious intent, likely to drive traffic to malicious sites or potentially download further payloads. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-free-no-download-game-hack
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-daily-spins_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-robux-com-real_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-robux-with-no-survey_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/minecraft-mod-menu-apk_GM479516143.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-more-robux-for-free_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/free-roblox-website_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-spins-on-coin-master_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-robux-no-verify-2021_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-coin-coin-master_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-multiplayer-minecraft-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aac.bin
62347f6c3a4255ba57ea5b4757679546b4a0abd54844f5f33ed4942fe75cf020		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAC 25280 bytes
font_01_sfnt_off000085a3.bin
e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A3 2908 bytes
font_02_sfnt_off00008f9d.bin
594f974c71c1e9b72d2021421f5ea77f9f9dd5e689ba96d2b51dc4efe6f30b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9D 18680 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.