Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af8f2972c433a07…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 11:43:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b10ad6d303b07cdbaeaa7cabe8e85746 SHA-1: 87473dfcd3d6532852460cf262a86f545c71f958 SHA-256: 1af8f2972c433a07b252f725d4984e0eef10caad529b99841cce7d04c259ddb6
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/what-do-roblox-points-do-game-hack PDF link annotation
    • https://dirigentigiustizia.it/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/roblox-hack_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/rbx-free_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-app-2021_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
font_00_sfnt_off00004c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C51 24976 bytes
SHA-256: 93a64274a7868f2de820a926a780fce82fab2bcb01ba85a5b416b97361d1481f
font_01_sfnt_off00008607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8607 18920 bytes
SHA-256: bcbace7f2968187c9b0e7948c76ec4c5d121751191c9fcebe9b281b5414d3343

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