Malicious PDF — malware analysis report

Static analysis result for SHA-256 51172a3f1a9cf295…

MALICIOUS

PDF

51.0 KB Created: 2021-05-16 15:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 631d91f56fae28a7f94467a9903298d6 SHA-1: 641f6c5e3011f07be7cf0ffb4c26655be6d98ded SHA-256: 51172a3f1a9cf295df3b1293a227b9d94495df99fe3f9c7647f75ab6e50e87af
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are presented as 'free Robux' or game-related lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or phishing operation. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially garbled, contains URLs and text consistent with a scam. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/free-robux-no-apps-game-hack
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/free-robux-without-verification-or-survey_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/ways-to-get-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/how-to-play-minecraft-for-free_GM479516143.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/coin-master-hack-pro-gamers_GM406889139.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/roblox-robux-hack-generator_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/robux-hack-free-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/to-get-free-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/roblox-builders-club-free_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-35-8_GM406889139.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/free-spin-link-coin-master_GM406889139.pdf
    • https://elearning.man3kuningan.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-code_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004df8.bin
9b12e460d9b32721926642920482d24d6fc61d59cb8f1dc9100194070a35a27c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF8 39760 bytes
font_01_sfnt_off0000a632.bin
dd781f2eaffddff6619a7729b763fabd5b8c4a088eef07f4c149f41bf202d502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA632 18192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.