Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdd5304a3770088…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 20:52:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e80251d2bb6ad84d6e4a135c3834b77 SHA-1: 2fca30e138ff7002149e28e275aa0b44b2594bea SHA-256: 9bdd5304a3770088a46b5e5a7e14c763697c5e99fefd90744158d602f59e83f8
142 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering free in-game currency or hacks. The ML classifier strongly indicated maliciousness, and the presence of brand impersonation (Facebook, TikTok) suggests a phishing or scam attempt. The document's structure and embedded links indicate it's designed to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/835599320/how-to-get-free-tiktok-coins-game-hack.
  • 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.online/app/835599320/how-to-get-free-tiktok-coins-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pokemon-go-free-quick-catch_GM1094591345.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
stream_004_off00004eb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB6 24584 bytes
SHA-256: 9ba74c7f8cc33a60a64721f1d80bbc94b90a4b06c11356057f90cc49d3324d82
font_01_sfnt_off0000874b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 17620 bytes
SHA-256: 5e08b925a0f8fe2d80e54c1999b1c3763f905cccf1acde0f5739739445e42325

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