Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d98e672bcf4c54…

MALICIOUS

PDF

43.1 KB Created: 2021-05-18 03:49:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7387059a7f4d2f7d89ccd439d9b32872 SHA-1: 146266de51effc8e79ea5600d674a63cd37f9e49 SHA-256: 87d98e672bcf4c54be97833374114127543ca9eee2111c29759a415394aae9de
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to SEO-spam-like content related to games and hacks. The ML classifier also flagged this PDF as malicious. The presence of a 'download button' lure suggests an attempt to trick the user into clicking these links. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/free-printable-roblox-coloring-pages-game-hack
    • http://acktivities.com/images/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://acktivities.com/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdf
    • http://acktivities.com/images/hack-coin-master-net_GM406889139.pdf
    • http://acktivities.com/images/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://acktivities.com/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://acktivities.com/images/coin-master-hack-online-link_GM406889139.pdf
    • http://acktivities.com/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdf
    • http://acktivities.com/images/robuxy-com-free-robux_GM431946152.pdf
    • http://acktivities.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://acktivities.com/images/coin-master-reward-link_GM406889139.pdf
    • http://acktivities.com/images/coin-master-daily-bonus_GM406889139.pdf
    • http://acktivities.com/images/coin-master-spin-blogspot_GM406889139.pdf
    • http://acktivities.com/images/free-minecraft-skins-java_GM479516143.pdf
    • http://acktivities.com/images/coin-master-332-apk-free-download_GM406889139.pdf
    • http://acktivities.com/images/coin-master-tiradas-gratis-2021_GM406889139.pdf
    • http://acktivities.com/images/free-coins-for-planet-master-game_GM406889139.pdf
    • http://acktivities.com/images/coin-master-cheat-free_GM406889139.pdf
    • http://acktivities.com/images/coin-master-daily-free-spins_GM406889139.pdf
    • http://acktivities.com/images/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://acktivities.com/images/coin-master-free-download-pc_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c55.bin
810111b14574580cf2853c323baae2e3489b9a6ff12d27a28d237361c74470f0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C55 24408 bytes
font_01_sfnt_off0000845f.bin
f22d79a70b62bbec10ea11b75a8e86d594265e936435116ae9b425eeb9411305
pdf-font-stream PDF embedded font (sfnt) at offset 0x845F 18844 bytes