Malicious PDF — malware analysis report

Static analysis result for SHA-256 12316139f9d11034…

MALICIOUS

PDF

46.3 KB Created: 2021-05-11 17:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f2021ddff2c06ccf17ef5c2715f8e5a4 SHA-1: 904ca9d9fce3b6c37857012c9c832fff698d4209 SHA-256: 12316139f9d11034ac1d856cf77ffaa7316be8e4f5b093256f7ed4aa1a2359b2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm, directing users to websites that promise free Robux and game rewards. This is a common lure for phishing and scam operations. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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-site-game-hack
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/roblox-got-talent-piano-hack_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/coin-master-free-spins-that-really_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/rewards-roblox-com_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-do-you-get-robux_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-survey_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/earn-free-spins-in-coin-master_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-to-send-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/free-minecraft-server-maker_GM479516143.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/free-robux-download_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/roblox-robux-codes-2021_GM431946152.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/coin-master-golden-cards-hack_GM406889139.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://elearning.matsada.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-iphone_GM406889139.pdf
    • https://collectrobux
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b07.bin
43bc4249523b7d60d18cc1a3b234869a2afdce9a3a4139b8bc18afa37be9d97c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B07 25184 bytes
font_01_sfnt_off00008521.bin
515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8521 4008 bytes
font_02_sfnt_off000092ad.bin
d17cd47be652198dd65b1182653c5b68eec39c9a25c2fe205f68dda680ae7be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AD 18236 bytes

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