Malicious PDF — malware analysis report

Static analysis result for SHA-256 821ca9d36659251a…

MALICIOUS

PDF

34.4 KB Created: 2021-06-27 16:28:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 11d203e5657140905847df4f96bbb337 SHA-1: c22864d4d2c26cad28be66f7502e40a83dcd367f SHA-256: 821ca9d36659251af500596c9fe43f7f299de846343e036ba8abaeaa29f7972a
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a document body that promotes free in-game items for popular games, suggesting a lure for users to download further content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are likely malicious or lead to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/cheating-asimo-roblox-game-hack PDF link annotation
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/how-to-get-free-robux-2021-unpatched_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/best-free-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/free-easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/teleport-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/hack-de-allah-akabar-roblox_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/robux-free-gen_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/how-to-get-free-robux-without-using-personal-information_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/free-unused-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://e-learningman17jakarta.com/__statics/gudangsoal/files/como-tener-hacks-en-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3000 22180 bytes
SHA-256: 3dd7744cd360ebdd03bc479db4285a06e4bd5c71564c822fd08ad306e690777e
font_01_sfnt_off0000610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 19136 bytes
SHA-256: 49cb4377068ef9ba5e045fedba8e82d9cc3a7b7fddfc1e0de387939f29fa6c0e

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