Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5c56be2a711aa1…

MALICIOUS

PDF

41.6 KB Created: 2021-05-19 19:14:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 47e1b274b6f512a364f11f4298ffb509 SHA-1: b9854e580b13747e13a8aade370cd6fd684b974b SHA-256: 9d5c56be2a711aa1886e22bf32fe4570effd20c5f5728f8d9c2368e9fc099134
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes "Coin Master Hacks" and "free Robux", indicating a lure for users to download potentially malicious files. The heuristic PDF_SEO_LINK_FARM firing suggests a large number of these links are present, likely to create a link farm for SEO manipulation or to distribute malware. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/coin-master-hacks-no-surveys-game-hack
    • http://lv-siegen.de/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://lv-siegen.de/images/free-robux-for-kids-no-verification_GM431946152.pdf
    • http://lv-siegen.de/images/how-to-hack-coin-master-ios_GM406889139.pdf
    • http://lv-siegen.de/images/master-coin-free-spin_GM406889139.pdf
    • http://lv-siegen.de/images/free-pet-snacks-coin-master_GM406889139.pdf
    • http://lv-siegen.de/images/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • http://lv-siegen.de/images/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://lv-siegen.de/images/roblox-hack-download_GM431946152.pdf
    • http://lv-siegen.de/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://lv-siegen.de/images/minecraft-free-online-games_GM479516143.pdf
    • http://lv-siegen.de/images/roblox-free-robux-hack_GM431946152.pdf
    • http://lv-siegen.de/images/roblox-script-hacks_GM431946152.pdf
    • http://lv-siegen.de/images/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://lv-siegen.de/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdf
    • http://lv-siegen.de/images/robux-generator-no-survey_GM431946152.pdf
    • http://lv-siegen.de/images/coin-master-villages_GM406889139.pdf
    • http://lv-siegen.de/images/best-site-for-free-coin-master_GM406889139.pdf
    • http://lv-siegen.de/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • http://lv-siegen.de/images/coin-master-hack-spins-apk-download_GM406889139.pdf
    • http://lv-siegen.de/images/roblox-free-followers_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a13.bin
7dfd2dfa601604c2ec52987a3b6dd87eca095e08a66fa77120af9a0304b3ec9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A13 24004 bytes
font_01_sfnt_off000080a5.bin
55a2c5e1b7f94918972dbf36de35b773a73c2c126b1f6e018f905b5ffe646750
pdf-font-stream PDF embedded font (sfnt) at offset 0x80A5 18148 bytes