Malicious PDF — malware analysis report

Static analysis result for SHA-256 40773f272d28849d…

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 21:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d4ab1fac7d528c89dba370faddbb544 SHA-1: badc85e3d6e15c4e0b098cf3ce57bfc9779d9a10 SHA-256: 40773f272d28849d9c07aef207cc58123570fb408d3ae441383cd4f57a0a4dbd
122 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to IP addresses, which is indicative of a link farm designed to host malicious content. The document body and extracted URLs suggest a lure related to game cheats and free items, aiming to trick users into downloading further malicious payloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/promo-codes-for-free-stuff-roblox-game-hack
    • http://111.68.26.74/widyapustaka/repository/cheating-on-broken-bones-roblox_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/free-coin-master-spin-app_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/robloxnation-com-free-robux_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/minecraft-116-1-download_GM479516143.pdf
    • http://111.68.26.74/widyapustaka/repository/60-free-spins-coin-master_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-spins-coin-master_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/free-spins-coin-master-app_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/hack-coin-master-link_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/coin-master-gold-cards-free_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-script-hacks_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/free-robux-no-human-verification-no-hack_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/village-4-coin-master_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/mine-minecraft-games-for-free_GM479516143.pdf
    • http://111.68.26.74/widyapustaka/repository/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-robux-no-survey_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/master-hack-coin_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/free-unlimited-coins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000524e.bin
6990ef58c48d814aca0015f7b738d19a2c294821351394f6cdf72ee64d5d8afc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524E 25208 bytes
font_01_sfnt_off00008bc2.bin
10430e8126fbff28516bb20c06e7b02352f4bbb59092ec1bd798a31617b84af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC2 18780 bytes