Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17641f463307188…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 04:37:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b29d62406e6132dddd95ea01badedca6 SHA-1: d5c148a1a26cbcc5480185f5f222758278f2a4cb SHA-256: b17641f4633071880790490d54102401f15caeff7e44fc8f3f8b9d1a83da0fd1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to various scam-related URLs. The document body and extracted URLs suggest a lure for game-related cheats or hacks, specifically for Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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-free-spins-and-chips-game-hack PDF link annotation
    • http://gavertrimmers.be/images/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://gavertrimmers.be/images/get-free-robux-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
stream_003_off00004ce8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CE8 24480 bytes
SHA-256: 9d72befb7c823549185d8c5d208a062002f5bb57eeed9ad1d5394cb6f7bd0592
font_01_sfnt_off000084e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E5 18224 bytes
SHA-256: 40df3a528aafa73505b8835a2bb808a281604419b6ece47625fe10d66aca2743