Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5b2275628650ea…

MALICIOUS

PDF

45.3 KB Created: 2021-05-14 21:15:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 678d1858e3cc1bf61661e9f78a107250 SHA-1: 55c749a1beb0cd9ba8eff8895e69cb5d7a56314b SHA-256: af5b2275628650ea85394da6cfacbfb3638d25b8e5211afd2030c2d3c28d23fa
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content related to games like Roblox and Coin Master. The primary URL, 'https://netcdn.xyz/app/431946152/free-robux-no-human-verification-no-survey-game-hack', suggests a lure for free in-game currency, likely leading to malware or phishing. The ML classifier strongly indicated maliciousness, and the presence of a link farm reinforces this assessment.

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 https://netcdn.xyz/app/431946152/free-robux-no-human-verification-no-survey-game-hack PDF link annotation
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/roblox-arsenal-hacks-download_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_off00004d64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D64 27956 bytes
SHA-256: e5261c882c9c567ea8e49e1f72463e5c7bf733c621a89aa1b7b4ca80ef67ec1e
font_01_sfnt_off00008c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4B 19156 bytes
SHA-256: 339d1e55aee7c6169fc9e26e1541ea9d6c779f781f53a8c1d652dbe4fbeac478

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