Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a77bbb615bf28c…

MALICIOUS

PDF

34.2 KB Created: 2021-06-25 16:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5235cd108ef305e850c212ec1ba5d83a SHA-1: 6a5c044a21ed0c3f0d9e33df0bf4f499a9e4ca4e SHA-256: 99a77bbb615bf28ceb84d08a1e3e4b9537e469687d26fb6fd231851f3890b526
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a "doc body" that explicitly advertises free in-game currency and hacks for popular games. The heuristic findings indicate a link farm and external URI, strongly suggesting the document's purpose is to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/pizza-place-roblox-hack-game-hack
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-app_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/feel-free-roblox-library_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/easy-robux-today-com_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/fastbucks-me-robux-for-free_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-bedrock-free-with-java_GM479516143.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/buy-delta-roblox-hack_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-for-roblox-no-human-verification-or-survey_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-accounts-with-passwords-2021_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-card-codes-july-2021_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-jailbreak-how-to-get-a-free-bugatti_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-coins-for-flip-master_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/claimbox-free-robux_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/pokemon-go-free-verizon-code_GM1094591345.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/master-coins-free_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-codes_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-hack-download-android_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-c9m_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003042.bin
ce6f2b15543575dba98af51fdae8e3505099563da395cbdc3967cc65af80e749
pdf-font-stream PDF embedded font (sfnt) at offset 0x3042 22004 bytes
font_01_sfnt_off000060e5.bin
6a9e1023cfeaad4018d4c49d2458a7e828188a87b66182e8184bc27d41dffc46
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 19012 bytes