Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fadbd638041969…

MALICIOUS

PDF

42.4 KB Created: 2021-05-18 03:50:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e96c2756f8468ca40cf4729a87e6b534 SHA-1: 3b22859141ccb7d8af23fb8d7cff26ac3a6add04 SHA-256: 16fadbd63804196997efc37202956ccc281ea2bc5db4ff3ad083a4befbf7daba
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are related to "free Robux" or "Coin Master" cheats, suggesting a lure for potentially malicious content. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures point towards a phishing or scam attempt, likely using these links to download further payloads or redirect to malicious sites.

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-robux-script-game-hack
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-link_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-spins-may-11-2021_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/minecraft-that-you-can-play-for-free_GM479516143.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/grab-points-login_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/microsoft-store-robux_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/rbx-roblox-robux_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/free-spins-coin-master-daily_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/get-me-free-robux_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-spins-fb_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/robux-games_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/www-robux_GM431946152.pdf
    • https://amozeshportal.ir/assets/uploads/pages/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048a3.bin
83f83e3d1c4b2adefbfd99e06ccc96c1eedcb73761633b5f44929e76bfb8bda2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A3 25600 bytes
font_01_sfnt_off000082fa.bin
7904477eb6282cb79bb1f8d95588be1a5283b3abf5667e30a4d761915d4b26ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x82FA 18416 bytes