Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5df656d987b045…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 06:18:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a11e35bd51a2a8d5ca77478afba34cb7 SHA-1: 58fc11801e32bc38a1a41000918c9b3fa806a76d SHA-256: 1e5df656d987b0454aea450f83ecdf318a2ae64f228de16e0f73a0aa72870fe1
122 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many pointing to IP addresses, designed to lure users into downloading more malicious content. The document body and extracted URLs suggest a scam related to free in-game currency and accounts for popular games. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous links points to a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://netcdn.tw/app/406889139/free-daily-coin-master-coins-game-hack
    • http://36.94.36.7/elib//repository/how-to-change-roblox-username-for-free_GM431946152.pdf
    • http://36.94.36.7/elib//repository/coin-free-spin_GM406889139.pdf
    • http://36.94.36.7/elib//repository/free-spin-link-for-coin-master_GM406889139.pdf
    • http://36.94.36.7/elib//repository/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://36.94.36.7/elib/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://36.94.36.7/elib/repository/roblox-script-hack_GM431946152.pdf
    • http://36.94.36.7/elib/repository/free-auto-clicker-for-roblox-mobile_GM431946152.pdf
    • http://36.94.36.7/elib/repository/coin-master-free-spins-hack-link_GM406889139.pdf
    • http://36.94.36.7/elib/repository/robux-codes-generator-no-human-verification_GM431946152.pdf
    • http://36.94.36.7/elib//repository/free-robux-discord_GM431946152.pdf
    • http://36.94.36.7/elib//repository/free-spin-link-coin-master_GM406889139.pdf
    • http://36.94.36.7/elib//repository/coin-master-free-daily-spins_GM406889139.pdf
    • http://36.94.36.7/elib//repository/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://36.94.36.7/elib/repository/how-to-get-free-hats-on-roblox_GM431946152.pdf
    • http://36.94.36.7/elib/repository/free-2021-robux_GM431946152.pdf
    • http://36.94.36.7/elib//repository/free-robux-now_GM431946152.pdf
    • http://36.94.36.7/elib/repository/daily-free-spins_GM406889139.pdf
    • http://36.94.36.7/elib/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://36.94.36.7/elib/repository/tuto-comment-avoir-des-robux-gratuit-hack_GM431946152.pdf
    • http://36.94.36.7/elib//repository/hack-coin-master-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e54.bin
012c3293e607bf4e25e7d023027ebca8b56e9ae6e94e78819eed61a2d0c69f36
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E54 22264 bytes
font_01_sfnt_off00005fa7.bin
a746bb805760b15596d5c6c3484423ee939af8cec1bd760416259ea5ac6d7b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA7 18420 bytes