Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a69de011c0850c…

MALICIOUS

PDF

34.5 KB Created: 2021-06-30 06:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c343a5ac4c0581d282edbf24552971b SHA-1: dfac618351853d6aacca9a36a7c5348452d03e84 SHA-256: 16a69de011c0850c0b730692e82538028d6c7ccd4c3199b21152b89bbd70723b
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are presented as 'SEO links' pointing to pages related to game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to direct users to potentially harmful content or phishing sites. The document's content and structure are designed to deceive users into clicking these links.

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/photostar-hack-client-inject-error-roblox-game-hack PDF link annotation
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/use-the-rarest-item-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coolest-outfits-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-password_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/e-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/urbx-club-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-hack-com-login_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-glitch-acsesoir-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/dugeon-quest-roblox-hack_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.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_off0000309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309A 21904 bytes
SHA-256: 766934cf68ddbaee9fbff83a5b7a4c0736fcc0b32c91ac2025c41e619420d1e9
font_01_sfnt_off00006101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 19388 bytes
SHA-256: 9534be9ec0c2f7f987041725c9b86905230ccc95f2a49bac9219bb25d13ee9d6

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