Malicious PDF — malware analysis report

Static analysis result for SHA-256 40605f4af03749e5…

MALICIOUS

PDF

34.2 KB Created: 2021-06-21 22:08:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 245cbf3890e0de4dc25bbee422e30c20 SHA-1: cd8955d6c5a67644129fa30870cd805df8018a9e SHA-256: 40605f4af03749e59c4ae347f65ec3af1abded398df49744b4eec31b7acf23f9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes game hacks and free in-game currency, indicating a lure for users to download malicious content. The presence of a large number of external links, many with SEO-like slugs, suggests a link farm designed to attract users searching for cheats and exploits. The ML classifier also strongly flagged this PDF as malicious.

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-hack-deutsch-game-hack PDF link annotation
    • http://zercalo.org/images/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-jailbreak-speedhack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-codes-2021-live_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/money-cheats-for-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-change-your-roblox-username-for-free-2021_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_off00002d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D66 22672 bytes
SHA-256: 90289500a926fd93be92f7d678eb3658828dee5c80ac1747532e06c90eb6d650
font_01_sfnt_off00006014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6014 19236 bytes
SHA-256: caaad7f73ca9d85e8a91de98e61b7ae5a16c64b14ad30d13c097ef71739e5a20

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