Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c1316a372756f3…

MALICIOUS

PDF

34.7 KB Created: 2021-06-21 22:07:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 361f8aeb56cd90f61811feec09bb820e SHA-1: 087198b5374862679b18c15f69e90861fe584d3c SHA-256: b9c1316a372756f3bac6e9012e239802aad13634b0fa17c76263402b86eed773
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to other PDFs offering game cheats and virtual currency. This pattern suggests a "link farm" designed to attract users with promises of free in-game items. The presence of a "download button" heuristic further supports the idea that the document is intended to trick users into clicking links that may lead to malicious downloads or further exploitation. The ML classifier strongly indicates malicious intent.

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/406889139/master-free-spins-and-coins-game-hack
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/daily-coin-master-spins_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/code-how-to-get-50-free-crystals-roblox-miners-haven_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-free-spin-app-iphone_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/roblox-top_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-client_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-robux-live_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-limiteds-roblox_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-facebook-page_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-32_GM406889139.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-robux-with-no-survey_GM431946152.pdf
    • http://elearning.mtsmanbaulhuda.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003156.bin
34658730e27230851bbfa469dfe4f07128d5d320c6ba791e3105cb670c6f0e4a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3156 22948 bytes
font_01_sfnt_off000064de.bin
5321b7127370ebf6f6dfbf643ed4bfa6daf0fc81f1b3cb36fd08dfd1331f5ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 18348 bytes

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