Malicious PDF — malware analysis report

Static analysis result for SHA-256 835d3c38848fadb6…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 11:18:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f6f858699a41a077aa82bd2a825e5f5 SHA-1: 0b72203d17d312f6f0bd3a91448369cc816e3663 SHA-256: 835d3c38848fadb615595dbbc0b9932a5957b538d6e4aef550344d619d02fd9f
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as a link farm for SEO purposes, pointing to sites offering game cheats and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a phishing or scamming attempt. The primary goal appears to be directing users to external sites that likely host malware or facilitate further scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/www-rubux-game-hack PDF link annotation
    • http://acktivities.com/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/rbx-sites_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://acktivities.com/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/earn-rbx_GM431946152.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_003_off000048d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D1 25628 bytes
SHA-256: d2b95101639fc346eacbc6807f51422961b8ee8d51e8be431f0313b605057f45
font_01_sfnt_off00008478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8478 18068 bytes
SHA-256: fc38c016acc36c76b7a0729eb2c8d98b0fd59e97c8a3cfb4a698daadf76a8d1e

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