Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ab4ab2a532a0fd…

MALICIOUS

PDF

44.7 KB Created: 2021-05-20 06:50:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ac4d8073e253c983619fd6d669af72ef SHA-1: 92634ca71dc11397cac805409f5bfbccd3d31de4 SHA-256: 78ab4ab2a532a0fd8cd1a6c46c208460b01b63f470a1c366b30308a385ba931e
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on suspicious domains and point to files related to game hacks and cheats. The ML classifier also flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick users into downloading malicious content.

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/1094591345/pokemon-go-free-lucky-egg-game-hack
    • https://www.bumbar-sport.hr/files/minecraft-java-edition-key-free_GM479516143.pdf
    • https://www.bumbar-sport.hr/files/how-to-hack-coin-master_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/coin-master-hack-spins-free_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/roblox-login-hack_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/coin-master-daily-free-rewards_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/robux-miner_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/get-more-robux_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/free-coin-coin-master_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/free-roblox-executor-no-key_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/pokemon-go-free-promo-code-2021_GM1094591345.pdf
    • https://www.bumbar-sport.hr/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/a-lot-of-robux_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/roblox-hack-ios_GM431946152.pdf
    • https://www.bumbar-sport.hr/files/moon-active-games_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/coin-master-free-pet-food-links_GM406889139.pdf
    • https://www.bumbar-sport.hr/files/get-free-robux-info_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004692.bin
dc830f94f64ca7016b5229ff53ab030c37ac1052c8a2facd894ef01c04b8013f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4692 24556 bytes
font_01_sfnt_off00007edd.bin
99dd96e89babb04aea0f0ebf99e33ebde901eaa524a16077e4ca0928c8dd6ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 3636 bytes
font_02_sfnt_off00008ba9.bin
24cbf755e8111f1f69607c5c2e73ec439fa36009b4612923b4309d04e980f133
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 18448 bytes