Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e9f8451a131af1…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 05:50:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca58551e3183b163083e61dac08c3cbf SHA-1: 629eed843a10e0164af568c6ee63efc789198410 SHA-256: d5e9f8451a131af153bf8af38d9f933a3a1324dd483b33db3457ff1420a66c7e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized slugs pointing to game-related hacks and free currency. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the structure and content 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/406889139/coin-master-hack-twitter-game-hack
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/coin-master-for-pc-free-download_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/coin-master-free-spin-now_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/coin-master-card-collection-hack-2021_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/roblox-2021_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/earn-robux-sites_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/roblox-free-hair-girl_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-hair_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/can-you-give-me-robux_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/coin-master-hack-iosgods_GM406889139.pdf
    • https://www.elearning.mtsn1surakarta.sch.id/__statics/gudangsoal/files/free-robux-pastebin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d4.bin
c0765e04e9c8feffd433e588dbad44a8a018fa9b7cff116634865a9fb28efd22		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 25248 bytes
font_01_sfnt_off0000824c.bin
91c2be8de5132e4c01efff6048559585f8cc3e87dd90bf946d8d6b14de046cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x824C 17880 bytes

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