Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94e7286903cabea…

MALICIOUS

PDF

44.8 KB Created: 2021-05-18 05:54:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 08ee4206140b7f7e462e5854d8ed97dd SHA-1: 7821f9e6cfbc24be1f92c1b506aad209e855950b SHA-256: c94e7286903cabea0bdd5c983f523e18333cca637b02a32771ec981ee672a2b5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game cheats and virtual currency. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-online-no-human-verification-game-hack
    • http://hardbit.cn/images/get-me-robux-for-free_GM431946152.pdf
    • http://hardbit.cn/images/free-pe_GM479516143.pdf
    • http://hardbit.cn/images/earn-robux-websites_GM431946152.pdf
    • http://hardbit.cn/images/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • http://hardbit.cn/images/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://hardbit.cn/images/how-to-give-robux-on-mobile_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://hardbit.cn/images/free-robux-codes-no-verification_GM431946152.pdf
    • http://hardbit.cn/images/free-robux-discord-servers_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-hack-xyz-download-free_GM406889139.pdf
    • http://hardbit.cn/images/get-2021-free-spins-on-coin-master_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-free-spins-reddit_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-hack-app-ios-download_GM406889139.pdf
    • http://hardbit.cn/images/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://hardbit.cn/images/today-free-spin-coin-master_GM406889139.pdf
    • http://hardbit.cn/images/facebook-coin-master-hack_GM406889139.pdf
    • http://hardbit.cn/images/roblox-hacked-version-download_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-hack-2021_GM406889139.pdf
    • http://hardbit.cn/images/apps-to-hack-coin-master_GM406889139.pdf
    • http://hardbit.cn/images/free-robux-without-any-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004929.bin
7a3ed30daa47c214343eee23e1ca3291546bca756f09b80ead5a168c46e8677f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4929 25396 bytes
font_01_sfnt_off00008266.bin
03f8397bdf627aa5eb6acb233d3c5d547fa213245667a48a7f92829839117302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8266 2920 bytes
font_02_sfnt_off00008c7d.bin
44fb42a750761b479d1ff9d84c79b576d569f1302724d8c024f9fb96550a5546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7D 18324 bytes

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