Malicious PDF — malware analysis report

Static analysis result for SHA-256 49874c20b9ae0f46…

MALICIOUS

PDF

34.9 KB Created: 2021-06-26 14:12:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6c87079fa273c08556dab75154ef7f72 SHA-1: e1f778b9afe9588f5579ad153cb87b123309a303 SHA-256: 49874c20b9ae0f4684ce9e9715365ce23ced9a6adf51c8b7ab3c96ee9deaeb3f
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files, suggesting a link farm designed to attract users searching for game cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a call-to-action phrase further supports a malicious intent to redirect users to potentially harmful content. The primary goal appears to be distributing or linking to malware disguised as game exploits.

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/roblox-wall-hack-jailbreak-game-hack
    • https://www.astrospace.com.tw/upload/files/free-free-roblox-games_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/roblox-pro-hack-script_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/minecraft-free-download-android-apk-014-0_GM479516143.pdf
    • https://www.astrospace.com.tw/upload/files/how-to-get-infinite-robux_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • https://www.astrospace.com.tw/upload/files/where-to-get-free-robux_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/robux-download_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.astrospace.com.tw/upload/files/free-robux-no-apps_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/how-to-hack-a-roblox-account-easy-2021_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/pubg-uc-buy-in-pakistan_GM1330123889.pdf
    • https://www.astrospace.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdf
    • https://www.astrospace.com.tw/upload/files/free-roblox-dominus_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spins-a2z-help_GM406889139.pdf
    • https://www.astrospace.com.tw/upload/files/roblox-noob-skin-free_GM431946152.pdf
    • https://www.astrospace.com.tw/upload/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdf
    • https://www.astrospace.com.tw/upload/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://www.astrospace.com.tw/upload/files/hacks-for-electric-state-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000303d.bin
94d88a58265c80bb8006997e09b85e2a2f26001bba40f21341ad6e02b9a34195
pdf-font-stream PDF embedded font (sfnt) at offset 0x303D 22760 bytes
font_01_sfnt_off0000632e.bin
5b20a7fa6cc1d8211b5972f69759a6c472bcef34010b9ddba7ccf20433caef1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 19140 bytes