Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a3b3b26d700582…

MALICIOUS

PDF

44.5 KB Created: 2021-05-17 03:17:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e656b6a62e6e0828854ab18ef80fe51 SHA-1: e8bcaddcdb18f3bcf08e32baa6323721a512a77b SHA-256: a4a3b3b26d70058240512c6bdc4838bc02c8e71a6cbb31f2df6d658f2bc6f5c5
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, forming a link farm, with the primary URL pointing to a game hack. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links are designed to appear as legitimate content, likely to trick users into downloading malware or visiting malicious sites. The ML classifier also flagged the document as malicious with high confidence.

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/479516143/mcpe-game-hack
    • http://lekarinfo.mk/images/coin-master-hack-app-for-iphone_GM406889139.pdf
    • http://lekarinfo.mk/images/free-coin-master-app_GM406889139.pdf
    • http://lekarinfo.mk/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://lekarinfo.mk/images/level-coin_GM406889139.pdf
    • http://lekarinfo.mk/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://lekarinfo.mk/images/coin-master-free-spins-only_GM406889139.pdf
    • http://lekarinfo.mk/images/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://lekarinfo.mk/images/martian-lettuce-coin-master-free_GM406889139.pdf
    • http://lekarinfo.mk/images/coin-master-spins-for-free_GM406889139.pdf
    • http://lekarinfo.mk/images/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://lekarinfo.mk/images/free-robux-stream_GM431946152.pdf
    • http://lekarinfo.mk/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • http://lekarinfo.mk/images/roblox-hack-ga_GM431946152.pdf
    • http://lekarinfo.mk/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://lekarinfo.mk/images/archery-master-3d-coins-hack_GM406889139.pdf
    • http://lekarinfo.mk/images/free-robux-generator-no-survey_GM431946152.pdf
    • http://lekarinfo.mk/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://lekarinfo.mk/images/free-spins-coin-master-daily_GM406889139.pdf
    • http://lekarinfo.mk/images/coin-master-redeem-code-free_GM406889139.pdf
    • http://lekarinfo.mk/images/cmaster-club-coin-master-hack-tool_GM406889139.pdf
    • http://www.freenom.comHey
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049b9.bin
f6e8223d676280349ce75ad115bcc8c2fd286d5c492b974037670e67354dfea9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B9 25460 bytes
font_01_sfnt_off00008410.bin
801f6fa60decd1add2f223f91580103c35e150c924465f86a7a572b3e00674f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 3128 bytes
font_02_sfnt_off00008e4f.bin
bad2551fb36a1ff37c0a2928a0b0bdd7baf715808b6c6c89c87aa6c39ddc14cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4F 17292 bytes