Malicious PDF — malware analysis report

Static analysis result for SHA-256 672161d19a348047…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 14:14:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02ed50872fdd35788a40254b6ae6de93 SHA-1: c817778e9c0ffd6be237e223f0654aa6518d29c8 SHA-256: 672161d19a3480477897983960b0b4f8e0cb5c0cc1f26fc9c5b9e8f8f6423946
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to gaming-related topics like 'free robux' or 'hacks'. The primary external URL, 'https://netcdn.xyz/app/431946152/free-headless-head-roblox-game-hack', suggests a lure for game exploits or cheats. The presence of a PDF link farm heuristic and ML classification strongly indicates malicious intent, likely to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-headless-head-roblox-game-hack PDF link annotation
    • https://www.devries-group.de/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004939.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4939 26396 bytes
SHA-256: d0ccc9fbbd40066fb88839f32d56e1b7b48a08e120ec00a06763d3a29bfd3f61
font_01_sfnt_off00008504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8504 18348 bytes
SHA-256: 63d99b8cbf455ab0d965626ac401ea421cc47a85f69736e4fa719bce4e2c55ac

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