Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ac73e33466588…

MALICIOUS

PDF

44.6 KB Created: 2021-05-19 23:19:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5a1b40f51ae6916187075b20a894d538 SHA-1: a3abd79bc6a65cc81b0b070aade554d5b360caeb SHA-256: ef8ac73e334665880ba8a0da28d6d4f3e3aa29ff6ccdb0801d2ff800360c0b94
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external links, many of which appear to be part of an SEO link farm, suggesting a tactic to drive traffic to potentially malicious sites. The presence of a download button lure and a high ML classifier score further indicate malicious intent. The document likely serves as a lure to download further payloads or visit compromised websites.

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/1330123889/pubg-uc-india-game-hack
    • https://marielyst-grundejerforening.dk/images/free-robux-without-human-verification-real_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/spin-coin_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/minecraft-texture-packs-free-download_GM479516143.pdf
    • https://marielyst-grundejerforening.dk/images/www-roblox-com-robux-free_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/roblox-hack-2021_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/robux-generator-without-verification_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/coin-master-daily-spin-free_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/free-roebucks-no-human-verification_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/get-free-spins-coin-master_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/is-roblox-free-on-xbox_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/blogspot-free-spins-coin-master_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/how-to-get-free-robux-on-computer_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/robux-earning-websites_GM431946152.pdf
    • https://marielyst-grundejerforening.dk/images/minecraft-apk-114-4_GM479516143.pdf
    • https://marielyst-grundejerforening.dk/images/coin-master-app-free-download_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/coin-master-free-pet-food-links_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/how-to-hack-coin-master-apple_GM406889139.pdf
    • https://marielyst-grundejerforening.dk/images/free-100-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045e2.bin
1c885b7adf0ba84749c22e7a58a3d59f834894dec0bef2b41ba8ad07165d7f75
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45E2 32064 bytes
font_01_sfnt_off00008bd8.bin
b212ecfa65d4d14d1e3e1ff5323cc747ae182e2c638b5b902a2f1485d27879fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD8 18420 bytes