Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad62e46ff667f1…

MALICIOUS

PDF

45.1 KB Created: 2021-05-17 06:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 54010e2aab3b732655fd25623aed3018 SHA-1: 42fc52a69fe86e1aa7cee3976d2c40d05a71505f SHA-256: f5ad62e46ff667f1bb50ad2ab4664c2066f3efd9f3a488acf2612f17d175f7f7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body that promotes free in-game currency and items for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely malicious or lead to phishing sites. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, which could lead to credential harvesting or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/free-coin-master-spins-daily-game-hack
    • http://unilin21.ru/images/coin-master-hack-online-generator_GM406889139.pdf
    • http://unilin21.ru/images/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://unilin21.ru/images/how-to-get-free-minecraft-alts_GM479516143.pdf
    • http://unilin21.ru/images/how-to-get-free-roblox-hair_GM431946152.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://unilin21.ru/images/roblox-studio-free-download_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-free-spins--coins-2021_GM406889139.pdf
    • http://unilin21.ru/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://unilin21.ru/images/update-coin-master-free-spins_GM406889139.pdf
    • http://unilin21.ru/images/can-you-hack-coin-master_GM406889139.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-inspect_GM431946152.pdf
    • http://unilin21.ru/images/free-robux-android_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-free-cards-and-spin-link_GM406889139.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://unilin21.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://unilin21.ru/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://unilin21.ru/images/daily-spin_GM406889139.pdf
    • http://unilin21.ru/images/free-spins-coin-master-generator_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f7.bin
b6318f7ce96bb69d02155683f065007af4dd38a7c48a21f6f70fb5005a69518b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 25228 bytes
font_01_sfnt_off000083d2.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
pdf-font-stream PDF embedded font (sfnt) at offset 0x83D2 2840 bytes
font_02_sfnt_off00008d84.bin
55b350ba652cc81c58cde26cd3be3a49d0b7ceb69ba015e6646fbbf561effc1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D84 18308 bytes