Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5f9b199d8976ee…

MALICIOUS

PDF

45.1 KB Created: 2021-05-10 14:12:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a5c9e4a281338acfae249508428af53 SHA-1: 9ac7f535e19ff21f4c9329a948b6b4e0c2753eff SHA-256: 3d5f9b199d8976ee7ffad130825c8dc4d1ee5aae6d84d5ba56584e0f8641daac
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. The primary link, https://netcdn.xyz/app/431946152/claim-robux-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest an attempt to deliver a second-stage payload, likely through a drive-by download or by exploiting a vulnerability in the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/claim-robux-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-in_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-can-i-get-minecraft-for-free_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
stream_003_off000048cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CD 25272 bytes
SHA-256: 5a148909473d03b0e1d8244247ab6f05c4ef002625e7ab45149337301a8a0eef
font_01_sfnt_off0000839a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839A 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00008d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D35 18532 bytes
SHA-256: 5f88bcb9a20179fc356a8464fa62ff550b3c80ad45ddbf6fdbf78de33d5b2b60

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