Malicious PDF — malware analysis report

Static analysis result for SHA-256 3356c74cfc4ce1f7…

MALICIOUS

PDF

44.8 KB Created: 2021-05-16 03:01:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ea8ea86a045009b9a6c942f9884183e1 SHA-1: e1a4f68241a7af3638213892be0fe761eaf3f7ab SHA-256: 3356c74cfc4ce1f71701ca556ff1315193df01ec4b7ec8de9b5261ab6bd440b7
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to lure users with promises of game hacks and cheats. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the malicious intent of directing users to external resources.

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-lost-world-2021-game-hack
    • http://neltalen.nl/images/free-coins-coin-master-blog_GM406889139.pdf
    • http://neltalen.nl/images/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • http://neltalen.nl/images/free-robux-no-human-verify_GM431946152.pdf
    • http://neltalen.nl/images/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://neltalen.nl/images/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://neltalen.nl/images/get-free-spins-on-coin-master-links_GM406889139.pdf
    • http://neltalen.nl/images/roblox-free-accessories_GM431946152.pdf
    • http://neltalen.nl/images/free-roblox-accounts-with-builders-club_GM431946152.pdf
    • http://neltalen.nl/images/how-to-block-someone-on-coin-master_GM406889139.pdf
    • http://neltalen.nl/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • http://neltalen.nl/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://neltalen.nl/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdf
    • http://neltalen.nl/images/free-robux-com-no-verification_GM431946152.pdf
    • http://neltalen.nl/images/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://neltalen.nl/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://neltalen.nl/images/coin-master-hack-tool-apk-download_GM406889139.pdf
    • http://neltalen.nl/images/coin-master-free-generator_GM406889139.pdf
    • http://neltalen.nl/images/robux-redeem_GM431946152.pdf
    • http://neltalen.nl/images/free-spins-on-coin-master_GM406889139.pdf
    • http://neltalen.nl/images/daily-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004975.bin
e4950468c53fd1deb35ee2e884bdaa36f9b6b05694147a866fee7bcc0dcdc72b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4975 24480 bytes
font_01_sfnt_off0000818a.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x818A 2880 bytes
font_02_sfnt_off00008b75.bin
fe6e96bee4f2349a2275eb1baf9951ec67b0217a441ba60f2b7a82c0a0005a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B75 18564 bytes