Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3a670da080baab…

MALICIOUS

PDF

45.2 KB Created: 2021-05-13 11:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c82a47b4d5f528a70d1bc1deb004cfef SHA-1: 6395a2b7c72659b8dc05f9e002c3718302daf72b SHA-256: fb3a670da080baabbdcb6093d8b4840af0eebb38e3c72529a9815dd1bd017228
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 0.9621

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.
  • 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.
  • 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/how-can-i-get-free-robux-game-hack PDF link annotation
    • http://eltisstudio.sk/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004960.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4960 25220 bytes
SHA-256: d1db22df69faa64921c9fabbc291e936f598709b71797b1ff0259b2af7330c65
font_01_sfnt_off000083a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 2840 bytes
SHA-256: 787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606
font_02_sfnt_off00008d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D61 18512 bytes
SHA-256: 69cba7171cc96811b03769255314e8880e2b1f1f28661a6eda79c3c7ec8a929e

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