Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb7385278875ba5…

MALICIOUS

PDF

36.8 KB Created: 2021-06-20 01:39:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fb3ba2242f80e05fec29ce19a33921a0 SHA-1: b14a3997d472405c7ba10fd6e869a9885575832c SHA-256: aeb7385278875ba5982cafcd9688e7c5049296584d887cca9d166cdcd37b5393
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a primary URL that promise free in-game currency, a common lure for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or a mechanism to distribute malicious content across many domains. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this PDF.

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.co/app/431946152/games-that-give-you-free-robux-2021-game-hack
    • https://bioscience.kyst.com.tw/image/data/files/se-puede-hackear-coin-master_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-make-roblox-clothes-for-free_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-new-link-free-spin_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/robux-apk_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/cheat-for-roblox-anime-fight-simulator_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/robux-sign_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/cheats-for-coin-master_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/100-free-spins-coin-master_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-spins-coin-master-app_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/easy-robux-today-com_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/robux-come_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-wurst-hacked-client_GM479516143.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdf
    • https://bioscience.kyst.com.tw/image/data/files/earn-robux-for-roblox_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003498.bin
30afb9838fc45b2a9307912d5d236638000d09b01adf895e074e8a4cbd750ccd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3498 22900 bytes
font_01_sfnt_off00006814.bin
0611fcc778eccdcb7744228ea4580fb3c1e683110b4febcd9cafd925e5dffce0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 20044 bytes