Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a8341e2adda9a2…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 21:37:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f89e34ab831bb4fafe3dec83da1385d5 SHA-1: 0cb31d8e988ee67480bf6057145e3559010db15c SHA-256: c3a8341e2adda9a297ac52240f19374de39108dbb610d1bb42482ae3e357299f
162 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to resources promising free in-game items or currency. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to solicit sensitive information like private keys or passwords, disguised as a way to obtain these 'free' items. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-promo-code-game-hack
    • https://xhse.vn/public/upload/files/free-coins-and-spins_GM406889139.pdf
    • https://xhse.vn/public/upload/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://xhse.vn/public/upload/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • https://xhse.vn/public/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://xhse.vn/public/upload/files/coin-master-free-spins-only_GM406889139.pdf
    • https://xhse.vn/public/upload/files/coin-master-links-free-spins_GM406889139.pdf
    • https://xhse.vn/public/upload/files/how-to-get-free-robux-app_GM431946152.pdf
    • https://xhse.vn/public/upload/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • https://xhse.vn/public/upload/files/free-coin-master-cards_GM406889139.pdf
    • https://xhse.vn/public/upload/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdf
    • https://xhse.vn/public/upload/files/real-robux-generator-2021_GM431946152.pdf
    • https://xhse.vn/public/upload/files/free-robux-app_GM431946152.pdf
    • https://xhse.vn/public/upload/files/minecraft-pe-hack-client-ios_GM479516143.pdf
    • https://xhse.vn/public/upload/files/coin-master-working-hack_GM406889139.pdf
    • https://xhse.vn/public/upload/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • https://xhse.vn/public/upload/files/how-to-hack-roblox-games_GM431946152.pdf
    • https://xhse.vn/public/upload/files/roblox-free-login_GM431946152.pdf
    • https://xhse.vn/public/upload/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • https://xhse.vn/public/upload/files/minecraft-free-download-linux_GM479516143.pdf
    • https://xhse.vn/public/upload/files/free-coin-master-cheats_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049ee.bin
a6d631f2551f65c99a15064da4073b7ccb918b1176e801f1e84e3b56b6ef8862		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EE 25632 bytes
font_01_sfnt_off000084f1.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F1 2880 bytes
font_02_sfnt_off00008edc.bin
dc3ef91c42b56b19e880a129857b9cc4209ff723fc15082788877c1745c42c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 18476 bytes

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