Malicious PDF — malware analysis report

Static analysis result for SHA-256 a505d67d608eb84f…

MALICIOUS

PDF

44.2 KB Created: 2021-05-14 09:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 129f9c35056788656ee1d1e14cd6a45c SHA-1: a998a88908bbff8367d07f27f10ccaf51587cf28 SHA-256: a505d67d608eb84f5360e0b390fe9b3f2cc39e47e1da029e4541548e0f61b4d8
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a link farm heuristic, indicating it is designed to redirect users to external sites. The document body and extracted URLs suggest a lure for game-related hacks and cheats, likely leading to malware downloads or phishing. The ML classifier also strongly flagged this PDF as malicious.

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 https://netcdn.xyz/app/406889139/coin-master-hack-no-verification-2021-game-hack
    • https://cormixhydro.ru/images/coin-master-card-collection-hack-apk_GM406889139.pdf
    • https://cormixhydro.ru/images/robux-hack-tools_GM431946152.pdf
    • https://cormixhydro.ru/images/free-links-for-coin-master_GM406889139.pdf
    • https://cormixhydro.ru/images/roblox-free-no-download_GM431946152.pdf
    • https://cormixhydro.ru/images/free-spins-coin-master-without-survey_GM406889139.pdf
    • https://cormixhydro.ru/images/apps-that-give-you-free-robux_GM431946152.pdf
    • https://cormixhydro.ru/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdf
    • https://cormixhydro.ru/images/free-accessories-roblox_GM431946152.pdf
    • https://cormixhydro.ru/images/can-i-play-minecraft-for-free_GM479516143.pdf
    • https://cormixhydro.ru/images/minecraft-free-download-windows-10_GM479516143.pdf
    • https://cormixhydro.ru/images/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://cormixhydro.ru/images/lazyblocks-com-free-robux_GM431946152.pdf
    • https://cormixhydro.ru/images/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • https://cormixhydro.ru/images/100-hack-coin-master_GM406889139.pdf
    • https://cormixhydro.ru/images/coin-master-spins-for-free_GM406889139.pdf
    • https://cormixhydro.ru/images/coin-master-hack-apk-no-survey_GM406889139.pdf
    • https://cormixhydro.ru/images/coin-master-hack-apk-download-2021_GM406889139.pdf
    • https://cormixhydro.ru/images/coin-master-pet-food-free_GM406889139.pdf
    • https://cormixhydro.ru/images/coin-master-unlimited-spins-hack_GM406889139.pdf
    • https://cormixhydro.ru/images/free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a62.bin
6053aae75d8ee8b632534d9ac7636a5c5d1e11685551cc26b79f0a0990f38032
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A62 30220 bytes
font_01_sfnt_off00008a9b.bin
180d563c5e2d4e96f25bdfb7de4de3bd7d6a0696216fbddae55f211609535b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9B 18252 bytes