Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff1beb64a5bc780…

MALICIOUS

PDF

35.4 KB Created: 2021-06-29 21:52:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d2f3c0f8b947962fbc9a38471e53dd0e SHA-1: c4b34aff197aac845d82f51f9129c4e68d05240e SHA-256: aff1beb64a5bc780db80cfabd92c70bb80542fc9b99f810fd9624de334a8cdb7
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDFs, many of which appear to be related to game hacks and cheats for popular games like Roblox and Minecraft. 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. The document's primary function is to act as a link farm, directing users to download files from external, untrusted sources.

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/roblox-bloxburg-free-pastebin-game-hack PDF link annotation
    • https://linhkien247.vn/public/upload/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/free-roblox-accounts-no-pin-2021_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/roblox-how-to-get-gamepasses-for-free-2021_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/dms-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/how-do-u-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/roblox-royale-high-school-hacks-de-to-get-diamonds_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/how-to-hack-roblox-prison-life-20_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/noob-vs-pro-vs-hacker-vs-god-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/real-robux-codes_GM431946152.pdfIn PDF document text
    • https://linhkien247.vn/public/upload/files/minecraft-pe-mod-menu_GM479516143.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_off0000308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308F 23224 bytes
SHA-256: fe572726b7fb1e6851399c869398997db489ccbd0ae65b1925638bcb86347e43
font_01_sfnt_off00006523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6523 19168 bytes
SHA-256: 761ce8e7ded58d3c666d207b8432b3b3ed885a2f08b6672cf48bea3c0654d9dd