Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb116e73be5c620…

MALICIOUS

PDF

48.2 KB Created: 2021-06-11 06:04:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bbdba668b12b93fd9e4c3fb1edc5739a SHA-1: 4896682d598af82d2f8d12469736e66c21f3f59f SHA-256: cfb116e73be5c620f5b60e778d7f664b1965973c446cc8e0acb97a962ccca540
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related hacks and cheats. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or applications. The document's structure suggests it's part of a link farm designed to attract users searching for game exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/roblox-under-fighters-2-hacked-apk-game-hack PDF link annotation
    • https://lib.unitri.ac.id//repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-client-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-july-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/mcpe_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-roblox-gift-card-codes-2021-may_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-setup-a-minecraft-server-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
font_00_sfnt_off00005000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5000 25892 bytes
SHA-256: 35c35f62faec65c63055beeafdc33b63ab9513e5f444d8e907301205e8b1f509
font_01_sfnt_off00008b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B96 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9545 19684 bytes
SHA-256: f9c8d15f5ffd8cbc18554dd2c7ce9e3039a32997c59010accc102af5534317a6

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