Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aadf94d4ec3bee…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 07:08:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 091f27ee993a92cbd39501fd7776b416 SHA-1: bc36f69650ea35dcce2cb075506048421bf2ccfd SHA-256: 79aadf94d4ec3bee8dfad6501fdd788ced30102fb920ddae9b83288b3395da8d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are related to game hacking and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spamming tactic. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the nature of the content strongly suggest a phishing or scam attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-game-hacking-game-hack
    • https://doingimc.com/image/data/files/coin-master-free-spin-realme-products_GM406889139.pdf
    • https://doingimc.com/image/data/files/pubg-uc-price-in-pakistan_GM1330123889.pdf
    • https://doingimc.com/image/data/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://doingimc.com/image/data/files/free-promocodes-that-give-robux_GM431946152.pdf
    • https://doingimc.com/image/data/files/how-to-earn-free-robux_GM431946152.pdf
    • https://doingimc.com/image/data/files/roblox-account-hacker-tool_GM431946152.pdf
    • https://doingimc.com/image/data/files/daily-free-spins-coin-master-app_GM406889139.pdf
    • https://doingimc.com/image/data/files/roblox-bird-hack_GM431946152.pdf
    • https://doingimc.com/image/data/files/how-to-hack-on-roblox-adopt-me_GM431946152.pdf
    • https://doingimc.com/image/data/files/roblox-pc-hack-download_GM431946152.pdf
    • https://doingimc.com/image/data/files/roblox-shinobi-life-free-spins_GM431946152.pdf
    • https://doingimc.com/image/data/files/descargar-free-robux-hack_GM431946152.pdf
    • https://doingimc.com/image/data/files/coin-master-free-spins-app_GM406889139.pdf
    • https://doingimc.com/image/data/files/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • https://doingimc.com/image/data/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdf
    • https://doingimc.com/image/data/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • https://doingimc.com/image/data/files/roblox-anti-cheat-update_GM431946152.pdf
    • https://doingimc.com/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://doingimc.com/image/data/files/how-do-you-get-robux-for-free-on-roblox-2021_GM431946152.pdf
    • https://doingimc.com/image/data/files/robux-hacks-no-survey-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032e6.bin
f9298202829d104509688f78ee484c5a2dee8d87167b21f9994d1a3e2dddefe7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E6 23296 bytes
font_01_sfnt_off00006787.bin
2cce2bd7d0c34e42cbcfafb01eed0627e7eec2b35f394281c800f8d420957298
pdf-font-stream PDF embedded font (sfnt) at offset 0x6787 18264 bytes