Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf5accad1d69282…

MALICIOUS

PDF

47.7 KB Created: 2021-05-13 16:32:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83c6d22b1137b94dfea4e0b058b81748 SHA-1: c566867a9ade02efd7aa80dd30859b815bdb86ac SHA-256: 4bf5accad1d69282d1fb7cd679e51c0718a216e3d48cf42b8f9e904dd6a1d76e
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links suggests a malicious workflow designed to redirect users to potentially harmful content.

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/roblox-promo-codes-generator-no-human-verification-game-hack PDF link annotation
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA0 31604 bytes
SHA-256: dd1055a63e5c02db7542398166004c162239c2f1a094e125b9618a298632664e
font_01_sfnt_off0000963c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x963C 19100 bytes
SHA-256: da1745847f0d76ea82434fee3d569844ba056c0d901119001214af0940d395e7

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