Malicious PDF — malware analysis report

Static analysis result for SHA-256 038af336248eefbf…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 04:36:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81967c23b19c4d8f996299172508fb59 SHA-1: 4106c1518d8e696746dfb6893763b71db4cd27c5 SHA-256: 038af336248eefbff10830824f6d69e075faf8841bd8d52115ece3bfb2c2882f
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 files related to game cheats and free currency. The primary lure impersonates Amazon and directs users to a link hosted on netcdn.xyz, suggesting a credential phishing attempt or a download of a malicious payload. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a link farm designed to distribute malicious content.

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.
  • 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.xyz/app/431946152/free-robux-picture-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.xyz/app/431946152/free-robux-picture-game-hack PDF link annotation
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtssadat.sch.id/__statics/gudangsoal/files/best-way-to-get-robux_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_off0000491a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 26548 bytes
SHA-256: 84c97e9ce9d39b2187010b9f51dd07cc31de1eb856577130f7b63a34c34eafa8
font_01_sfnt_off00008699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8699 18392 bytes
SHA-256: 34b0e3a58c66b2af54b16d5c8d734c4555ce81663a4a6734022a64244545498a

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