Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ced876fb2c5a53…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 12:09:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 161a04d9ea5e38148790e8116704df09 SHA-1: 55f42d8d717b4a9ed205509cb3c6546e2e12ee07 SHA-256: 45ced876fb2c5a53240b19b0be43346a245239ba284ae34da3fdd8da1d19ad3d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are disguised as legitimate downloads for game-related items or currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to distribute malicious content or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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/freerubux-game-hack
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/http-bit-ly-coin-master-hack_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/coin-master-event-hack_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/free-minecraft-skins-java_GM479516143.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/free-robux-no-verify-2021_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/who-to-get-free-robux_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/spin-hack-for-coin-master_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-358_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/como-descargar-coin-master-hackeado_GM406889139.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://elearning.manbatam.sch.id/__statics/gudangsoal/files/free-spin-link-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_003_off0000492d.bin
aabeea5e5a672e96a71ea7ca50e1230c1beb27235c3b306fe97aad9c2a75b1d5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492D 26224 bytes
font_01_sfnt_off00008644.bin
f4416bbc5f287efcbe31c7b4c704cc92a0ced0ddcdd2f5cfb5fb7d41fdf7fc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 17872 bytes

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