Malicious PDF — malware analysis report

Static analysis result for SHA-256 f911cb2e8a53c4b2…

MALICIOUS

PDF

43.7 KB Created: 2021-05-11 16:07:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 57f237f8aa73687c08e788981914e571 SHA-1: a04df6a1038f7ab519620c916119e82e527c39cc SHA-256: f911cb2e8a53c4b2344ec9a07b115209ad5e6935f425e0634414a35e1235fe68
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also hosts a large number of external links, many of which appear to be part of a link farm. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-apps-that-work-game-hack, suggesting a scam or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-apps-that-work-game-hack
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-account-roblox-2021_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/100-free-spins-for-coin-master_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/is-minecraft-realms-free_GM479516143.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-robux-no-downloading-apps_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-minecraft-servers-to-join_GM479516143.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/bux-free-robux_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-game_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-to-get-robux-without-human-verification_GM431946152.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-ios_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-mod-download_GM406889139.pdf
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aee.bin
69ac7ec578caff75bb390a2dea0175f7d7a5af6e24b611e0e7cedc6ad25f9e00		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEE 25568 bytes
font_01_sfnt_off00008636.bin
867cc7ed7a05e00a705c8433c5324c57a550f7e7678a2e8c50298e1974253cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8636 19056 bytes

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