Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5553b7634dbe4d2…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 09:34:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 910e83e02211a50f75f8b9d4d700d295 SHA-1: 4ec3778d000b4b3a9bd159a4c04525bbc4a94c2d SHA-256: c5553b7634dbe4d2963ff900e228a585a170a8dea061d7816a1f9846b4809ace
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are disguised as free game-related content, indicating a likely phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM firing suggests a deliberate attempt to create a link farm, likely to drive traffic to malicious sites or pages. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-link-today-new-2021-game-hack PDF link annotation
    • https://tecturatw.com/image/data/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/tiktok-free-website_GM835599320.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-pe_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/where-to-buy-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/pokemon-go-free-evolve-with-trade_GM1094591345.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-free-spins-link-today-facebook_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_off00005146.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5146 25464 bytes
SHA-256: 391fa46a0808249bda27021aa5f012bd1a1cf984f7478b45ce8ea5d107fe84c2
font_01_sfnt_off00008b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B62 18976 bytes
SHA-256: 9ab4b87832590d82aec569b9c8693c2016d5d9151569e528de1ed13ad8a1cb2c

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