Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b97cc345f63988…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 01:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bf66dacc3002e78e3898305b409da38d SHA-1: 87fab1440ba707008f74ce215b64577addd97960 SHA-256: a9b97cc345f639883054fb810bb71b635150b10410129577a99ca69630dfee6f
162 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering hacks or cheats for games like Coin Master and Roblox. The document also explicitly requests recovery secrets or private keys, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially harmful content supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-without-verification-code-2021-game-hack
    • http://pescatun.es/images/hack-my-spins-coin-master_GM406889139.pdf
    • http://pescatun.es/images/coin-master-free-spins-apk_GM406889139.pdf
    • http://pescatun.es/images/coin-master-real-free-spins_GM406889139.pdf
    • http://pescatun.es/images/roblox-hack-com_GM431946152.pdf
    • http://pescatun.es/images/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • http://pescatun.es/images/coin-master-free-spins-facebook_GM406889139.pdf
    • http://pescatun.es/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • http://pescatun.es/images/app-master_GM406889139.pdf
    • http://pescatun.es/images/androeed-ru-minecraft_GM479516143.pdf
    • http://pescatun.es/images/free-coins-and-spins_GM406889139.pdf
    • http://pescatun.es/images/como-generar-coin-master-free-spins_GM406889139.pdf
    • http://pescatun.es/images/hack-coin-pro-coin-master_GM406889139.pdf
    • http://pescatun.es/images/roblox-rewards-robux_GM431946152.pdf
    • http://pescatun.es/images/roblox-but_GM431946152.pdf
    • http://pescatun.es/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://pescatun.es/images/coin-master-card-link-free_GM406889139.pdf
    • http://pescatun.es/images/regal-world-coin-master_GM406889139.pdf
    • http://pescatun.es/images/free-coins-coin-master-blog_GM406889139.pdf
    • http://pescatun.es/images/coin-master-hack-online-generator_GM406889139.pdf
    • http://pescatun.es/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004957.bin
9ae54e01f7569b2cb699f58b3a866d270c95ece6c5f23b997ea1ea19c5e59d27
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4957 25248 bytes
font_01_sfnt_off000082bb.bin
601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x82BB 2920 bytes
font_02_sfnt_off00008cd4.bin
e7c29375456855f284f4ba0d667fe5ecd3a1a77844b7b15bab65b2b0881a5718
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD4 18932 bytes