Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8520df811f47347…

MALICIOUS

PDF

46.1 KB Created: 2021-05-13 02:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 959978ad002804e4d71378484cccaeba SHA-1: a6aef91eb6fb99cfb1a60e8616529b263f392b92 SHA-256: e8520df811f473470df074430d870916bf91c01aece7c706ef21387696853879
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 0.9432

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/406889139/coin-master-fan-page-free-spins-game-hack PDF link annotation
    • https://raduzhnyj.od.ua/images/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/roblox-re_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://raduzhnyj.od.ua/images/free-robux-com-2021_GM431946152.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_off00004ad9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD9 25972 bytes
SHA-256: bc3b461a28a26a8b37bb005517370675b72762c9ba035ccc8db7b2b7d9b26254
font_01_sfnt_off00008648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8648 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9172 18328 bytes
SHA-256: d106028e9c816c4ed38d7f9dbfb4c1b42a2571be69ef627f7b4a635c4c6a8b94

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