Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a00e5d547dfe4ce…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 02:03:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 74ed418a39bc55f648c355fdab0f286f SHA-1: 74ad6886df1a08ce549072fc5dccc681f936b10f SHA-256: 7a00e5d547dfe4ced9b38942166ecd1cffc47a05f4cbe3d44b6d886cbdfbc116
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized links for game hacks and cheats. The document body and heuristics indicate a clear intent to trick users into downloading files from these URLs, likely serving as a lure for malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.co/app/431946152/roblox-hack-november-2021-game-hack
    • http://mbbs.hr/files/blackout-hack-roblox-download_GM431946152.pdf
    • http://mbbs.hr/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://mbbs.hr/files/does-coin-master-hack-work_GM406889139.pdf
    • https://mbbs.hr/files/get-free-robux_GM431946152.pdf
    • https://mbbs.hr/files/hack-coin-master-using-cheat-engine_GM406889139.pdf
    • http://mbbs.hr/files/gameoffice-net-hack-coin-master_GM406889139.pdf
    • http://mbbs.hr/files/how-to-get-free-skins-on-coin-master_GM406889139.pdf
    • https://mbbs.hr/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • https://mbbs.hr/files/pokemon-go-free-promo-codes-2021_GM1094591345.pdf
    • http://mbbs.hr/files/hack-coin-master-ios-download_GM406889139.pdf
    • https://mbbs.hr/files/coin-master-free-spins-2021-generator_GM406889139.pdf
    • http://mbbs.hr/files/free-spins-coin-master-twitter_GM406889139.pdf
    • https://mbbs.hr/files/unlimited-robux_GM431946152.pdf
    • http://mbbs.hr/files/orewards-com-free-robux_GM431946152.pdf
    • https://mbbs.hr/files/pubg-uc-esp-hack_GM1330123889.pdf
    • https://mbbs.hr/files/roblox-sad-cheating-story-albert-he-cried-on-video-new_GM431946152.pdf
    • https://mbbs.hr/files/coin-master-tiradas-gratis-2021_GM406889139.pdf
    • http://mbbs.hr/files/how-to-hack-roblox-using-cmd_GM431946152.pdf
    • https://mbbs.hr/files/how-to-hack-a-minecraft-account_GM479516143.pdf
    • http://mbbs.hr/files/do-you-gey-free-robux-with-builders-club_GM431946152.pdf
    • https://mbbs.hr/files/how-to-hack-a-mine
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb9.bin
fbd31d9c1d7748a80231dc50cf77902be8154682ae3516516f16469f43408199
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB9 22972 bytes
font_01_sfnt_off00006385.bin
92516b38c5b64fe0dd9752c0dfc392bc9049ae26f56d5217ee6d2ce2c3824a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 19432 bytes